Well, just 50MHz. And just one AD-converter. That is at three/four channels used the sample rate goes down from 1GS/s to 250KS/s. At least the Siglent SDS 1104X-E has two AD-converters, so one may use 1 or 2 channels at 1GS/s, or 3 or 4 channels at 500KS/s.
Despite, I think Rigol and Siglent are pretty much comparable. From me the Rigols just don't "look" good - the front panel with all knobs etc. seems not well structured. But this is with what you work with. A quite personal thing, sure, ...
Thanks for the answer,
I can afford SDS1202x-e but I can't afford SDS2202x-e.
I want to have a logic analyzer that is built in to to oscilloscope.
I am confused now. I can buy SDS2102 or SDS1104. Which one should I buy?
Real time sampling rate: 1 GSa/s
Memory depth: 14 Mpts
Real time sampling rate: 2 GSa/s
Memory depth: 140 Mpts
If I was to choose from the above, I would select the SDS2102X.
I believe it is ~$300 more than the SDS1104.
Thanks for the answer.
I will buy SDS2102X.
Please note, I donât have first hand experience with SIGLENT.
I use the RIGOL DS4034 350Mhz 4 channel scope (if I were to buy this again, I would get the 2 channel version).
I do have the 16 channel Saleae logic analyzer (old version without analog capability) also for logic analyzer stuff.
Please take some time and review some YouTube videos so you can make informed decisions.
Examples:
Thanks for the answer.
I will make my desicion wisely after I finished my research.
You have spent more time working with these scopes than me breathing, so the next time I'm buying me my first scope, I would surely take this words of wisdom into consideration
If you have not already found it, look at the EEVBlog Digital Oscilloscope Comparison Chart and the comments to it.
Also mind that a $10 logic analyzer combined with an application like PulseView is a fantastic thing to have when debugging 3V3 + 5V logic - check out this video.
So we come back to external logic analyzer, which I think is the better solution.
Despite, in case one want to use the scope for analyzing, say, an I2C-Bus already two scope channels will be occupied (for SDA and SCL). If there is a need/wish to check another signal on the same(!) screen, thus timely synchronized, only a four channel scope will do the job. Or this digital plugin.
I'm fine with LarryD's statement of 45 years experience that 2 channels are sufficient in most cases. My first scope had two as well - but the recent bought scope has four, and I already like it. One reason is: looking on a data bus AND something else.
Even though the two channel thing has another, positive, side effect: it forces you to really think(!) what you like to have a look at. Not just putting signals on the screen without knowing why.
That is my feeling also. The capabilities of a cheap clone analyzer + a PC are way beyond what a scope based one can do. This type of solution is scalable to higher channel counts and more advanced decoders compared to a scope based one. The only thing lacking is the ability to get good analogue performance highly time correlated to digital signals. Personally I don't need this often, and when I do, two or four scope channels is enough.
Logic analyzer probing above 10MHz or so is pretty challenging, and a solution under âŹ1,000 is probably not attainable.
Whoever mentioned the Rigol DS1054Z is on the right track. That plus a clone Salea 24MHz analyser and Sigrok is going to do the business. The 1054 can be upgraded to 100MHz and to have several useful decodes. Sigrok has 100s of decoders.
I have a GW Instek 2204A.
Great screen, larger size than others.
Made in Taiwan and not in China.
https://www.gwinstek.com/en-US/products/detail/GDS-2000A
4 channels, and I have needed all 4 at times.
Shop around, can find sale prices, or offers like free case or free probes.
https://www.tequipment.net/instek/?gclid=Cj0KCQjws-OEBhCkARIsAPhOkIY-dBqxKMSXt0QRCMihH3AXrHGgYczufkgdKL3p7yUrq456HyABuH4aAi2-EALw_wcB
https://www.tequipment.net/InstekGDS-2204A.html?search=true
I also like the way it captures screen images to USB stick.
I also have a Saleae 8-channel logic analyzer that I've used for checking 8 MHz SPI transfers, very handy.
Thanks for the answer,
I will buy a salea logic analyzer and siglent SDS2102. I think 2 channel is enough for me(I can't afford SDS2104x-e. That is the real reason 
). I will not use this in a company, I will use it for my projects. SDS2000x series has a touch screen that is a nice feature. SDS2000x series have 10 times higher memory depth and 2 times higher samplng rate than SD1000x series. Also I watched a lot of videos about SDS2000, SDS1000 and rigol DS1054z. In conclusion I liked the SDS2000 series.
Well, just a hint as you wrote about the SDS2102. Without X or X-E.
Siglent is introducing a newer generation of scopes, which can be, to my knowledge easily identified by lowest vertical sensitivity. 1mV/div is the "old" one while 500”V/div is the newer one.
On siglent.eu you may notice that pervious generation is lowered in price and almost sold out. But, talking about a 2-channel 200MHz scope with 2GS/s the Siglent SDS2102X-E might be right choice - and even cheaper than the older SDS2102X.
And check also possible application of "16 Channel logic probe module" ... as it has been on your wish list.
So, double check, go for it ... and have fun!
Thanks for the answer.
SDS2202X-E
It is in my wish list.
Glad youâve come closer to a decision.
There are many videos on YouTube (as discussed) showing the use of an oscilloscope.
The next thing on your list should be a microscope, the most used tool next to the soldering iron on my bench. 
Enjoy.
Thanks for the asnwer,
I will add it to my wishlist.
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