1 2 and 3 really mean nothing in absolute terms. Obviously, 2 is more powerful than 1. 3 more powerful than 2. but one person's 2 might be the equivalent of someone else's 3.
Beware of remaps which:
1. Do not involve rolling road time
2. Increase the boost without attention to the intercooling
3. At the top end, you really want a bigger turbo rather than a smaller one with the boost turned up to the max.