Yep, it's very confusing, and really depends on what you want. Now I know who's car it was and the spec, it makes it a little easier.

The Universal Turbo's version of the T38 (Can only speak from experience of this one and not the Turbo Technics Version) will definately spool up as early as your T34, It was specifically designed to do exactly that. But, where the T34 runs out of puff at about 6200rpm (Depends on Engine Spec), the T38 keeps producing good boost 2bar + all the way to my red line of 7400rpm (Soft Cut), and would keep producing above that. (I set my soft cut to this to keep the engine reliable).

Everyone has their own favorites, but I can speak from experience of both a T4 (Too much lag for me) and the T38.

Karl Norris who built my engine, was impressed and explained it as a T34 on steroids....Lol. Comes on boost like a T34, But keeps producing the boost well past 7000rpm, which the T34 is unable to do.