I have only played at two fields ever. Skyline Paintball today and Pev's AG Paintball in Leesburg on numerous other occasions. I like Pev's slightly better, but mostly because it suits my style of play a little better in that the opposing teams don't start right up next to each other. For people who like to play more of a speedball type play with a variety of interesting scenarios, you might prefer Skyline.
This is overall an excellent place to play. The staff seem very knowledgeable and friendly, although it did seem to take forever to get started. Once started the turnaround time between games was pretty fast.
Skyline clearly put a lot of thought and effort into the various fields. The "Town" is a mock town with proably in excess of 20 different building, some of which are two story. There are older automobiles and even a motorcycle to act as bunkers. The "Castle" is pretty interesting as well. It is a large Castle set on top of a hill and the attackers must get to the top. There are a number of more interesting fields as well.
The nice thing also is the pro shop is reasonably priced. My Evolution II hopper went down and I ended up purchasing a Halo B for the same price as I would have paid in my local paintball store.
As stated above, my style of play lends itself more to stalking type paintball games. So I would prefer to play where the opposing teams can't see each other when the game starts. Anyone who likes up front in your face speedball would really like Skyline and I would recommend traveling to get there.