I had a CMMG Radial Delayed Blowback 9mm and a Scorpion Evo pistol when I lived in Texas. I replaced the Scorpion with the CMMG.
Blowback AR-9 frequently require adjustments until they are 100%. They can generally be tuned and worked over to be nice. Scorpions have weird ergonomics, bad triggers, weird grips, and the recoil impulse is a bit harsh. They look cool though and are sometimes very cheap.
The Ruger and Henry PCCs are available in a California-legal version, so you could buy one after the ban, if it comes.
My vote is AR-9.
If there was a cool 16 inch MP5, I'd vote for that out of coolness. There's also the Kalashnikov USA KR-9, Beretta CX4 Storm, High Point Carbine, Kel-Tec Sub 2000, Kriss Vector, and a bunch of other random 9mm platforms.