How recent is the information upon which you base this? Is it from the old information in CBJN that has not been updated for years? I assume that it is not from personal experience: Thunder Valley has been slightly sweaty during the past three years; zero heat in Plac erville including at tables in its high limit room. Of course, your results can vary depending on the amount of cover you use--no idea how either would respond to straight play without cover. I no longer play at either location (by my own choice), but have associates who play there regularly in the range of the OP's betting levels. I would play in Plac erville (but not Thunder Valley) if I believed the best game were 2d, 3:2, h17, das, nls, nrsa with good penetration.
[If I am mistaken, LVBear, and you do travel to this region, communicate with me through back channels when you plan to be around. We might be able to do some lucrative plays together as long as you don't share it with others.]