The turbo 4G63T engines also prefer the smaller ports, rather than the much larger ports found on the likes of the NA RVR engines.
But remember, production engines are ALWAYS a compromise. When you're chasing the numbers, then you have to make sacrifices.
But given that porting aside, you're still going to have to do the same freshening up work to any head regardless of it's configuration, you might as well start with the better one. Then you can use the money you didn't spend on porting the inferior head, to give it a tickle up.