As as to which way to go only you can know the answer to that, if you want power then go turbo, you want something that is still fun but not fast then keep it na.
ask your self what is the purpose of the car?
how fast do u want it?
is it daily?
fuel economy etc?
if drift multiply your tyre bill by 5x
it is rare for a na car to be fast, but a na 20v is still fast enough to be fun