3G coverage is bound to be weaker than 2G/EDGE because 3G is still really being deployed.
3G coverage is getting better here but they still need to upgrade certain towers to 3G, this is the case in many other markets.. so it's really something you have to look into for yourself. If I lived in North Las Vegas and not South Las Vegas my experience with 3G would be totally different, 3G extremely solid in NLV, I've only seen EDGE once or twice there. Fully use your 14 day remorse period and port in from AT&T if everything checks out for you.
Happy T-Mobile Customer since '09
Content AT&T Customer since '12
Sprint? Accolades for most improved still doesn't mean good enough.