I find that the Ballista and Trespass have about the same stability. Both have some high speed turn followed by a decent fade.
I've thrown about 6 Ballistas and 8 or so Trespasses. Fairly consistent molds. I haven't run into any freak discs there.
The Ballista freaking bombs. If you like Trespasses you'll love the Ballista. Very, very long driver. It'll hang with anything on the market for sheer distance.
Trespass: 12, 5, -2, 2.
Ballista: 14, 5, -2, 2.
Only real difference is that the Ballista is a couple speeds faster.
The World is much more of a crapshoot. You may get a good wind fighter, or you may get something flippy. I've seen Worlds all over the flight spectrum. I won't even speculate what yours might be.