Everything I say below is just MY opinion. Other people probably think differently.
I don’t live in Cali and don’t know the laws there, but I assume it’s legal since it doesn’t have a pistol grip or “the thing that goes up”. The fact they require a tailfin on the sub2k is moronic, like it makes the firearm safer somehow or that a criminal won’t just remove it.
I like the sub2k well enough but it’s a range toy to me because it’s just not high quality - the fact it needs 3rd-party additions (the M-series - M for MCARBO upgrades) just to bring it up to “acceptable” is telling. They’d rather cut a few pennies instead of fixing the problems, then charging a little more. It shows their mindset.
The sub2k and my PMR30 are the only firearms I’ve ever had problems with. The sub2k was minor - the charging handle broke - but the PMR30 fired out of battery. Heck, the front sight fell off the first time I used it the day I bought it. Both guns were fixed but I’m not impressed by their track record.
Yes, the PC9 is heavier. You’re going to pay a similar price. I’d trust it over the sub2k in a personal defense situation, and it’s much more likely to last long enough to pass down to family.