[Nocturnal]

problematic ICS M4... meaning you may have to swap out a whole bunch of parts.

honestly you may or may not encounter problems with either of the guns.

Why? because you don't know if you'll get one working smoothly out of the box since it's your first gun. You don't know if it sounds unhealthy!~

Just pick one and buy it.

Just a word of caution, with all new players it is suggested by some in the community to try a Tokyo Marui AEG first for its reliability out of the box just to get you started.
This is to get you into the game without having to see your gun spending more time in the gun shop rather than the field. (unless thats what you want to do?)

Good luck on your choice.