Before I give my 2¢, just wanted to say thanks to you, Cynagen, for you efforts in providing servers for the WSGF community.
I would play either game, so I'm not sure how to vote, yet. It would be nice to have a different genre of game (NWN) available, but there are some points on SWBF2 that make the barrier-to-entry/likelihood to play much higher:
1) Drop-in gameplay, just like BF2, TF2, etc. (I don't know if NWN has this capability)
2) Like most shooters, 15-30 minutes of play can be satisfying. With NWN, sometimes it takes that long just to sell loot in a store.
3) Server can run a number of bots until they are displaced by human players, so you can actually play solo until other people join instead of practicing your sentry-building skills. ;)
4) Can support 32+ players. I'm pretty sure NWN has a much lower maximum. (again, I don't have hard data)
If SWBF2 is elected, I have some recommendations on maps to avoid. There is also a very nice 3rd party server manager available from Black Bag Ops.
@Mesh (and any others interested)--Best price:
SWBF2 $10 DVD version
I've got a bunch of SWBF2 game videos. If I posted some online would that help people decide if they want to buy the game? Sadly there is no demo.