I keep an eye on this and it seems that (pseudo)ephedrine while still used to produce methamphetamine, is harder to obtain (it being controlled as a precursor). In Russia and Mexico there are large facilities producing P2P BUT it does seem that when the cost of that precursor becomes too high, 'cooks' choose to resolve the active isomer and recycle the unwanted isomer using a chemical that produces free-radicals (such as AIBN) which raecemises that 'waste' and goes back into the the resolution step.
I suspect that bulk is also a consideration - it smuggling becomes problematic, it's obviously easier if only half the bulk needs to be moved.
It really has turned into a massive industrial-scale business with P2P being made in multi-tonne reactors.
But which is worse I couldn't tell you, only that whichever one currently predominates is always 'worse' than the other.
I think
@opiatekrzy is about right - most users don't really seem to notice. I suspect the only POSSIBLE advantage of the optically pure product is that it will more readily form large crystals which I've read some users will pay more for.
I suspect anyone who use methamphetamine will have encountered both forms and it seems older users are more familiar with the racemate who have a preference for it which may or may not be rational.