I have never driven on the left side, so sort of nervous on that front, but I am sure I can figure it out. I am hearing to avoid taxi's and to get a car if you are there for some time.
The Khao site noted tennis so that is good.

Both properties on the website look great. Assuming I get upgraded it looks like the 'sweet' rooms look better at Khao, but maybe I am just not seeing the Phuket rooms for all possibly upgrades.