If you are new and want a real casual day - Conders.
Bev caters to the casual player. She's got rentals, refs and a "tag" rule in effect at all times. Competition is light - you may run into some old-school ballers from time to time down there, but largely it's the occasional player and family/friends. Crowds tend to be light as well - except for their big games (held 3x per year) - they are worth the trip.
Phish's place (Third Eye) is great - especially in the cold months or the uber-hot days of summer. It's pure airball and all modern tournament-style play. Generally quality competition - noname teams and well known regional teams frequent the place.
Kenny's place (ASylum) has it all. Same modern tourney-style fields, although more of them. Competition is the same as at Third Eye - the same speedball junkies frequent both places. Unlike 3rd Eye, Kenny does cater to the walk-on casual player and will also host private groups. He's got a good woodsball area that he regularly builds upon (last count: Barrel Island, 2 random towers, Village with twin towers, two-story castle & lots of random bunkers scattered in a mix of bamboo, brush, trees & medium sized ravines).
He also hosts the occasional tournament and 3 big games each year - these are great as well and his prize list for these borders on legendary.
So, figure out what style of play you want and pick the one that best fits. Besides, if you don't like one place - go to another next time. Pricing (both paint and field fees) is about the same regardless of where you go.
Regardless of where you choose - you will have a good time. I suggest you call first and find out when they recommend coming - some days are better than others in terms of what is happening at a particular field.
Don't be afraid to ask for Bev, Kenny or Phish - they will all treat you right and do their best to ensure you have a great time.