Don't use the nRFs. They drop dead like flies. The 433mHz would be my recommendation.
In which case he would never consider I2C in the first place. Technically I would also not call that having two Arduino's in the same place - having a remote pretty much defines that there's no co-location...
Of course that's a need he perceives. What @Paul_B and I want to check is how valid that perceived need is. Sometimes you have to take a few steps back in dealing with a question to come to a more fundamental solution.
Not my experience.
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I bought twelve and they all died within a week of opening them. Hopefully the RF nanos I ordered will stay alive.
I have 20 that I bought at least 5 years ago that are still working fine. So YMMV, I guess.
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Oh ok, got it. I actually did not understand that what you and @Paul_B were trying to say in Post #16 , Post #17 and Post #19....
Well, finally, Serial suggested by sterretje, koraks, srnet, cattledog and imk123 solved my problem 
Since both Nanos have only one hardware serial port which is not available in my case, SoftwareSerial was the relevant solution. imk123, I really like the daisy chain loop idea!
I'd like to point out that wireless option suggested by IceChes and Devanshu_Acharya, especially the 433Mhz RF Modules, will definitely be used for another ongoing project 
Well guys, I want to thank you all for your valuable answers, it helped me a lot.
PS: I totally agree with the regress aspect raised by koraks and PaulB.
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