Its like this really, since everyone is offering opinions and not really comparing the two.

I'm almost finished with my 13.1:1 D series, and I know the ins and outs of boost as well.

It's cheaper to get high compression, but to use it, you need the proper internals and bolt ons.

You have to put a little more into getting a turbo system functional, but you see more in terms of power off the bat. Where as with high compression, you have to earn your power, not just "turn it up".

If you want to go fast, you have to pay for it. The differences just lie in where you have to put the money.