Has anybody compared loading times between the ps2 clsssic version (ps3), the ps2 version and the ps2 version ran from an hdd iso?

Normally ps2 hdd is fastest from what i know but ps3 sometimes comes out on top for some games.

Would ps2 hdd then be allowed even?

Thank you in advance (:

Are there any notable differences between the two? What is the common/recommended version for runs?