Has anyone here actually been to all of the United Polaris lounges that are currently open? Or at least most of them? If so, which in your opinion is the best one in the system to visit?

I am trying to book a flight on a *A partner to Asia from a US airport, and then SAUA for Polaris access. SFO is my "home" airport, but I can do a placement flight to just about anywhere -- LAX, IAH, ORD, or EWR. Seems SFO's lounge is physically the largest though, at over 28,000 square feet, with EWR a close second at around 27,000 square feet, and the rest around half the size.