I've been thinking about this exact thing past couple days.
From what I've seen, and it's been awhile, even despite the CA restrictions on ARs, the mechanics of swapping a magazine are not arduous (with the right mechanism, of which I couldn't say what that is). It's not quite as seamless as a push-to-drop release, but it's not taking the action apart with a screwdriver either. Probably an issue if you're in a 3 gun match (although, in theory, everyone else is having the same problem), but not anyplace else.
The benefits of that is you get a AR with all of that "box of parts" madness that ARs can do. Swapping, well, everything.
I know CA has recently qualified Other Parts as Have to Buy From FFL (though I'm not sure which parts, barrels, maybe? Uppers? Can you tell I'm up to date?), but, still, once you have a proper lower and the nonsense to deal with the magazine, it's an AR.
The Mini is a mini. They've got a lot better over the years, you can readily mount Stuff to them (scopes, rails, etc.) There's a few stocks available for them. Obvious you can't put a folder on it in CA.
I'm thinking of one simply to be less intimidating to my wife. The "rifle" shape is less off putting to strangers.
However, not locally pricing, but just looking at Rugers website, the Mini-14 is $1300(!!). Zoiks!
Pretty sure you can get an AR cheaper.
I don't really know of a good alternative either. Not interested in an SKS, don't like the Kel Tecs (I don't mind a polymer pistol, but not so much a polymer rifle). There is, of course, the M1A, which is, well, Bigger.
But there really not many semi automatic 5.56 rifles. "Why!?" when you have the ubiquitous and universality of the AR?
Looking like "A Team" but only semi auto.
A-Teams were semi-auto. Still couldn't hit anything with it.
If it's money and utility and versatility, the AR, by far, even in CA. But that said, there's nothing wrong with a Mini-14. Stainless in walnut are pretty.
Oh, and also, one benefit of the AR is that those machinations to bumble with the magazine Thing, if push comes to shove, you can fix all of that with a screwdriver.