I will have to disagree on the comparison for me personally. I've seen both, and I heavily prefer Hoa over Hemi and here why:
Hoa has way more Natural feel to her body and skin, she is softer and better moisturized and has that "youthful bounce".
Don't get me wrong Hemi is hot, her body is tight and fit, but she's more the athletic type and very firm to the touch. On top of the air being dryer than where she usually lives, her skin almost feels too cold unresponsive to skin to skin contact.
Service wise, both are very top notch and willing to please and accommodate to your needs.
It's true, both girls has had enhancements but they feel VERY different, again the theme is that Hemi is very firm everywhere (some do prefer it, not saying it's bad) while Hoa being softer and bouncier.
I'd say at the end of the day it really is based on personal preference and these are just my opinions, Hemi gives me the badass tattoo girl vibe and Hoa gives me the exotic asian companion vibe.