I have the 3 of them Z8, alpha, Neo, the RCU on Neo it's the smaller one, (personally i prefer the big one when I press the buttons).
I'm currently using the Neo plugged by cable and it works great of course if you only use for iptv, i also made a comparison in the speed of changing channels in between Z8/Neo and no differences, even if the neo have 1gb of ram.
Then if you would like a good in between choose the Alpha also for the price differences not that high and also because it can handle 2.4 / 5 ghz internal wifi when the neo only 2.4
Also the storage Alpha 8 /Neo 4gb and the neo do not have bluethooth.
All depends on your need but the Neo do the job !