Las Vegas Premier Paintball and Combat Zone is where the speedballers go in Las Vegas.
Good days at Combat on for SB is Wednesday and Sunday, for Premier I remember Sunday being a good day for the SBers, but I can't give a concrete idea now since I haven't been there in a while due to some outside events.
LVPP is in Summerlin area while Combat Zone is in the Southwest area (Anthem, Southern Highlands, etc).
So it really depends on where you are and what day it is in all reality.
Most people on here will say LVPP because it developed the biggest speedball/tournament following when we really had no large air fields in town other than it so it has evolved from there. CZ is newer, and thus has less traffic with the SB community who are now used to going to premier.
Both are good in my opinion, and won't dissapoint if you go on the right days.
my 2c, hope it helps!
Former UNLV Paintball President