I've been to Baptist, Penticostals, Mormon and Methodist churchs.
The Baptists were by far the worst, almost everyone was pretty much a self righteous, condescending, dismissive douchef*ck. Methodists were nicer but still not my cup of tea.
I used to go to a Penticostal youth church, the people there surprised me, the only thing about them that put me off was the speaking in tongues and gyrations, but other than that I really liked it, they were pretty openminded and liberal, they listened to rock music, talked about girls and didn't dress like the 1950s.
Mormons are swell guys and easy to get along with, but going to a Mormon church was one of the most uncomfortable moments in my life. First off there was the strict dress code, my uncle bought me clothes specifically for the occasion, and I didn't like that bit at all.
There was no preaching at all, just singing a lot of hymms and people taking turns talking about how their week was. It made other churches seem less boring in comparison.
Everyone there was friendly though and while conservative they also kept an open mind. I can't say that about the Baptist and Methodist churches I've been to.