Ive run them both. I like the Toomey pipe on a stock engine. It really made my un-ported Blaster come alive, especially in the midrange and up top. I sold my Toomey and bought a Trinity when I had my engine ported. I like the Trinity pipe as a good "all around" pipe. Good low-end, with a nice midrange hit and some left up top.
I will say that the Toomey pipe is by FAR the best-built aftermarket pipe for a Blaster. It has an excellent chrome finish, a billet aluminum exhaust flange with an 'O' ringed pipe joint that will not leak, and a silencer with swivel mounts that adjust in two places. A Toomey pipe installs easily and fits well, and the sleek silencer tucks up neatly under the rear plastics with room to spare, so you won't damage it if you accidentally stand a wheelie up too far.
While my Trinity pipe performs great, it was a PITA to install (poor fitment in the frame) and the build quality could be better.