i think you have to look at EVERY seperate case on its own. like my d17 aint shit until i slap a turbo on it. any d seires almost. and if you get the whole TODA kit for the k20 then you can throw down alot of N/a power. it depends on the specific application. i am working on putting together a turbo setup for my car. but i won't say one way or the other. it all depends on what you want. all of it. 1/4 mile times are made eaiser for boosted motors, but in autocross and such it could be a problem.
i think if N/a setups are done right they can be better then boosted setups. i mean for example, you have the WRX and the RSX-R. both have the same HP rating but the WRX is turboed. on one side, you have to wait for the revs to climb about 5k RPMS and up for the type R.(idk when the vtec crossover is on the type R but lets use 5krpms as an example.) after that its all gravy, cause its in its "sweet spot"
the WRX will have boost lag. not alot but some. its awd. so there is more drivetrain loss, and that does matter. it relys on the turbo for all the power, and if anything happens to it then the car is useless.
i think everything has advantages and disadvantages. and i think its all personal preference.