I use a Spyder Xtra and my other (potential) team members use Tippmans, I find that the Spyder has a better feel to it, and you're not locked into one manufacturers gear (think of it as Windows Vs an Apple Mac),
As a noob a cocker's not a great idea unless you know veterans or someone that knows how to upgrade one, they're a lot of work to adjust....(but i've got one next on my Wish list)
The guys that use Tippmans will say use a Tippman, those that don't will possibly reccomend the Spyder or another marker altogether...But as twisty says, try before you buy!
The Spyder (i'm told) is more "playable" as a tourney marker and I can get 8-10 bps from it (and that's newbie rate of fire!!
), whereas the tippman 98's are getting 6-8...the Tippman A5 a mate uses fires faster (reactive trigger will help), but to knock out the myth that a Tippman is more reliable than a Spyder, the past two events both Tippman players have had to get the Allen Keys out and the only probs I had have been with my Revvy falling off because of a loose feed neck....
so don't discount the Spyder on reliability terms. The worst thing i've heard about the Sypders, though, is that every now and then you'll get a crap gun in the batch which will consistently screw up on you, so it's maybe worth picking up a new one and keeping hold of that receipt.
Think that just about covers my opinions......(I just don't like the Tippmans, they look naff and put me in mind of Nokia mobiles, peeps buy them 'cos they're the easiest and everyone else has got one, and they're mass marketed...
)