Cali QB's, especially Southern Cali, tend to have a high bust rate, they're over coached on the private QB circuit & a little too overly manicured, meaning they're too coddled & pampered from a young age they tend not face adversity well. They plateau early.
The best Florida QB's are pretty much the South Fla athletes, the QB's from Northern & Central Fla usually aren't that good. The South Fla boys are usually really good athletes that get put at QB from lil league ball, Bridgewater always excelled due to intelligence & IQ, but normally South Fla QB's are athletically advanced for the position & the ones who get upwards of 6'0ft & don't get switched to WR/RB or DB tend to do well because they face tough competition all throughout their upbringing & have a chip on their shoulder due to being doubted at every step. They respond well to adversity.
Texas produces the best QB's & it's not close IMO. No state has more annual naturally gifted passers than they do. Maybe it's the baseball culture that helps builds arm strength, or the immense pressure that comes from the HS football culture in TX which is similar to FL in terms of competitiveness, or maybe it's really the Varsity Blues style Dad's lol, whatever it is, them boys in Texas can sling it.