Just looked through some of my old arhives for a bit more detail.
A standard 1.2mm hg gives a cr of 8.3
A larger 2mm hg gives a cr of around 7.3
If you're running a big turbo on a low cr then you will get laaaaaaaag but it will be safe and when the turbo kicks in it will be faster if you're running more boost.
The best analogy I can think of, that only you can answer, is which is faster, an EVO FQ400 or an EVO FQ340. In a drag strip its the FQ 400 but this has been shown being beaten by a a fiat skoda box from 30mph in 5th gear and taking nearly a mile to overtake (Feature was on top gear)
Maybe the question you should ask is which is safer rather than which is faster if you're running 2Bar. Other people with more experience of running turbo can answer that but IIRC, its normally gearboxes and diffs that fail with that boost than the engine (Assuming forged bits etc)
Jim