Hi there! I'm kinda new here, even if I have some experience with Arduino 
I want to build my quadcopter myself and I'd like to do the same for the transmitter, so I'm trying to get all the informations I can before buying stuff and beginning (because- you know- budget 
)
When I decided this, I immediately thought to use Arduino for both (with Multiwii firmware on the drone), but then I came accross a website (maybe more than one, I can't remember now, I'm sorry) where it was stated that Arduino is not always used as FCU because it's based on a 8-bit unit and it's better to use a 32-bit one.
So, I found out the Naze32 (I think the REV6 is the most recent) and I've read it's largely used; it even has some built-in sensors, starting from 3 gyroscope and 3 accelerometers if I'm not wrong. Then I thought about trying that (with Cleanflight) but sticking to Arduino for the transmitter: it's good, flexible, I have some experience in it as I said, plus I don't know any other board to do so to be honest 
Giving I'm getting right all this, it should be Naze32+receiver module (I've seen FrSky one are common) and on the other side Arduino+transmitter module (again, FrSky for compatibility).
Now, what concerns me is: would this setup be useless in terms of transmission speed, because one board is 8-bit and the other is 32-bit?
Moreover, I've seen threads like these:
Thread 1
Thread 2
but I just want to be sure that I can make them communicate in some way. I won't be scared if there will be the need to code something myself, as long as it's possible.
So, yes: will all this be possible, and hopefully bring to good results? Or do you think it's better if I stick with Arduino for both, being the first time? In this case, please if you can suggest me some good tx/rx modules (I only know Xbee and NRF24L01+)! 