I have to agree with Art, in that the Mini is sleeker and 'points' better, at least for me, than the AR does. My experiences with M16s, ARs and M4s have been mixed in terms of reliability, while my (less) experiences with Mini-14s is that they were utterly reliable whether clean, dirty, wet or dry. Also, I have had positive experiences with the accuracy of older Minis, but, I certainly have not met all of them, and I have come to believe there are more and less accurate guns of all types.
Ruger factory magazines are expensive, but there are inexpensive magazines of dubious quality for both guns (personal note, I do like the new 'anti-tilt' M4 magazines, but they still can tilt and 'jam', just not as badly as the green and black followers), so if one wants quality magazines, one will have to pay for them either way.
I've owned Bushmaster and S&W ARs and both could malfunction in feeding, extracting, ejecting, were fairly finicky about ammo, and more maintenance intensive. Years ago, I had an inexpensive, used Mini that was plenty accurate for field use; I shot any .223 or 5.56 out of it, the Ruger magazines seemed to be of excellent quality (much better than surplus M16), and easier to maintain (locking lug recesses, less of them, and easier to reach in the receiver, etc)
Plus, there is, for some, if not all, the 'politically correct' factor of the wood stock, no pistol grip, not an 'eeevil black rifle' factor.
Get what feels good to you and what you are comfortable with, what you enjoy. Even supposing that the mini is not as mechanically accurate, if you enjoy shooting it, enjoy it. I have come to love my Marlin 39, even though it may not be as mechanically accurate as a match target gun, and am better with it than I am with my old CZ and Ruger .22s, likely just because it is so fun I shoot it more. The best shot in our neighborhood is a fellow with some ancient Springfield semi-auto that you push a button in and it becomes a bolt-action gun, ancient, worn, not a 'match gun', but he is great with that thing since he had it from his childhood and still shoots it weekly.
So, get what feels better in your hand, on your shoulder, points better or handles better or (even) looks better to you, for you. And, shoot it. If you decide one way or another, you can always 're-choose' and maybe 're-choose' again.
Have fun..