Warning: rambling ahead...
Fortunately I own both AR's (or AN AR currently) and several Mini 14's... First and foremost: I LOVE my Mini's, and I trust the Garand-Action as much as anything up to and including a sharp stick. It's also hilarious to me to watch people completely jaw-drop
freak out over an AR and then not bat an eye-lash at a Mini-14 in a truck. Love that.
Per the OP, the reason I would "not" buy a Mini (if I didn't own one) is: "it depends on what it's for" (and if used, what series it was). With the AR556 in Ruger's line-up, the Mini is no longer a "budget alternative" and the money you save on the AR556 nets you wiggle room to either buy more ammo or dude up yer rifle.
So were it a "my first 5.56" situation or a simple Home-defense rifle buy I'd buy the AR556 or any other number of AR rifles for less. No the Mini isn't THAT much more then the AR556 depending on where you get it, but it's more expensive to mod and outfit (I only run Ruger factory mags and they're spendy and can be hard to find). It's also not as "mod friendly" as an AR (nothing is...) and if you're hiking with it, the weight can add up quickly if you're using glass on the factory steel-rings or some of the heavier "scout mount" style which are another thing that's personal preference. Also, and I DO NOT mean to insult anyone here by saying this or "dis" anyone's rifle because of what I'm gonna say but, the choice of Mini-14 Stocks SUCKS IMO. The Hogue and other "trad" style Rifle stocks are great/, but the others are either junk, heavy, HEINOUSLY expensive (*ahem* a Sage Chassis... although IF you can find one, THAT thing is cool IMO... it's like a Mini Marine EBR/DMR Rifle) or flimsy to the point of breaking under hard use. The Mini also has a lot of "little differences" between all the series changes that makes some stocks like the Archangel potentially hard to fit. All stuff to consider with the Mini-14/30/.300BO. The AR is like a Small-Block Chevy: May not be the best choice but you can pretty much rebuild one with parts from a 7-11... You can walk into any dam store that sells guns and it WILL have AR parts usually. Not so with the Mini. In fact I JUST found that a local place called Bi-Mart (it's like Walmart only not... well,
Wallmart) had several 20 and 30rnd Mini-14 mags and... I bought them all. If I did that everywhere I found AR mags I'd have...
a bloody HEAP of mags, or, the Gubment flying Black Helicopters over my house for having an "Arsenal" or some such garbage.
Now, if I had a collection of firearms and it was devoid of a Mini or two (I have 3 of varying era's and historical value to me including the first "real gun" I learned to shoot before I was "graduated" to the M1A by my Dad)... I WOULD buy a Mini. Definitely. Just not sure if it would be a new Ranch, or the new .300BO. (I like 18" barrels/blued/wood BUT, experience seems to show the 16" Tacticals to be the more accurate out of the box) Despite all the
[email protected]#$ people love to talk about them on the interwebs and at the Range sometimes... Mini's are great rifles and IMO they're kinda "historical" in their own right for all "Bill's BS", the A-Team (been watching old re-runs lately... such a hilarious show, nobody ever really get's shot but BOY do they spray and pray, I feel like I'm watching an ISIS training video or something) and other, less positive reasons. Plus as guys like Nutnfancy have shown on vid, they can certainly hang in a "tactical"/combat situation with anything in their class if handled by a competent Rifleman.
I don't expect to be holding off zombies, but around the ranch/farm I have, the mini-30 is a great truck gun with its muzzle on the floorboard and bouncing around. Its a tool to me and not a fetish so I don't worry about scratches or a little rust. Whether popping coyote, the occasional dog some ahole has dropped off on the road (I hate those people), or just shooting for fun, it takes rough handling and eats the cheapest ammo going.
Great example of what an awesome "Ranch Rifle" the Mini IS... And I hate "those people" too. I have a older 195-series Wood/Blue Ranch-Rifle that is in this exact "Truck Gun" set-up and I don't think I'd be as happy with an AR in it's stead. There's something "right" about a Mini in a truck... wish I'd had a Mini-14 when I lived in Australia working on a Cattle Station. 70-series LC Ute, Border-collie, Stihl Saw strapped onto the bed and my Mini-14 Ranch on the rear rack. Perfection.
Cheers
Dave