Like I said in another thread, depends on what you want.
If you want the maximum amount of horsepower per dollar, base Z.
BUT, you get nothing besides that. If you want some luxury and comforts, and sporty equipment, the 2.0 Supra gets an LSD, better interior, etc.
I'd go 2.0 without a doubt.
It really doesn't bother me not having one. It means nothing. My STI had one, my GTI had one, you look at it twice, and then never again. Same as the power gauges in the Supra, I had that up maybe 3 times in 2 years.
Edit: the only gauges I monitor on track are tire pressures and temps.