At the end of the day, all high end guns are similar and will do the job fine. I've shot an A1, Shocker (never again, hated em) and a DM8. Nice guns, but EGO's all the way for me, I wouldnt want to shoot anything else to be honest. Not a big fan of spoolers. Plus hes asking for an opinion for one or the other.
Whatever he gets he wont be dissapointed, all high end markers do the job you want, but each have there own advantages. I just gave my personal opinion on the two, but its his decision in the end. So I would advise him to try before he buys.