Hard to tell, i havent used the Iwata Revolution, but i have a Neo for Iwata and a Iwata Eclipse SBS sidefeed.
I also have the H&S Evolution Silverline, and personaly i like the Evolution best out of the 3 airbrushes.
The Revolution is harder to clean as the Evolution and the Eclipse since it uses a screw in nozzle. My Neo also uses one
and mostly i still have some paint left inside the nozzle if i dont take it out while cleaning, and if you take it out you always
have a little risk that it can break if you tighten it up just a little too much, even i havent had that bad luck yet with the Neo though.
H&S and the Iwata Eclipse series have a self centering nozzle that is very easy to take out and to clean. I also prefere the trigger on the Evolution
since its very soft to press and pull back. A other thing is for the evolution you can get different cup sizes. The cost for replacement needle and nozzle
is about the same between evolution and the Revolution, so that is not much of a matter which one to chose.
I can only tell you personaly i would get the Evolution, but its also a matter of personal preference what you like more. Would be best if you could
check them out in a shop personaly and see what feels better for you.