Sony HDD vs. 3rd party HDD

[woo124]

Hi,

I'm thinking of getting HD Loader, but I can't decide whether I should get the official Sony HDD or 3rd party.
Some advantage of Sony HDD are as follows:
better compatibility
FF 11
storing game saves

Advantage of 3rd party:
huge disk space

I'm primarily concerned about the first advantage. I heard that some games work in official HDD, whereas they won't work on 3rd party HDD. In general, I heard official HDD works better with HD Loader than 3rd party. Does anybody have further info on this?
What kinds of problems are there for 3rd party HDD?
Is it a big issue?
Currently, about how many games have problem with 3rd party HDD?
Lastly, I heard from someone that he had trouble with Sony HDD for his modded PS2 whereas he was find with 3rd party HDD. Has anybody experienced anything like this?

Thanks