We did not care for Planet Hollywood at all. The service was very poor and the food not that great. But that was several years ago. We just haven't ever taken the time to give it a second chance. I guess the atmosphere was pretty good.
HOB was good, except for DS's burger was raw inside so we had to send it back.... 2x. Another place we haven't been back to, but only because there are soooo many places to try.
Anyway, between the 2 I would definitely choose HOB. The service was great and aside from the raw burger, everything else was great.