I think this depends on your needs. We stayed at CBR, but enjoyed having a nicer resort and pool area since we spent more time at the resort than typical due to shortened park hours. CSR would be more conducive to this, IMO. But, QS at CSR is very limited right now and I believe the food court is closed. There's also no reusbale mugs. If you rely on resort QS, Pop may be better for this.
FWIW, the Skyliner is busiest at opening. If you plan to go a little bit after, its fine. On the way back and even at park closing, its fine. We did Uber whenever we took a bus at park opening because buses are such limited capacity and the bus depots were busy. There were also instances on the way back when we had to wait for another bus because we didn't fit, due to limited capacity. I'd be wary of this at CSR, since buses are the only option there.