Joined: Nov 2015
From: So Cal
I Ride: 1990 ZX-7 H2, 1992 ZX-7R K2, 1992 ZX-7/9, 2002 Ducati 900ie Supersport, etc...
Envious of your project and intentions...
As for which pipe to go and smoke, I'd suggest finding a dyno to see which one gives what curve and go from there. You're looking for every reliable pony you can make so finances allowing, it will be worth your time with the added benefit of knowing your combination is fully optimized.
You mentioned you're planning on some head work, etc. so considering the fact that you are going to be deviating from OEM trim, you are entering the unknown. Unless the pipes are full race and were bent with race mods in mind, they were tuned for a basically stock motor with a jet kit.
Both Yosh and Termi are known to make positive power changes so short of the dyno option, I'd say go with what you like aesthetically and in this case the Termi may give you a bit more ground clearance. I had a Sudco (OEM'ed by Hindle) standard height on my L1 I short circuit raced and in severe right handers would only just get into the front edge of the silencer, and that was after the bodywork was already skimming the ground. Not much risk of a high center, but maybe beneficial to have one less thing fighting for your attention with the addition of some more ground clearance.
Best of luck with the build and the TT man.