>.< JEFF, BENZY, ON TARGET.
As in stay with OP's predicament please...it's why we(me) clicked on this link. That's a cool comparison, I'm glad you're getting technical, but PrivMessaging has image-insertion features too. It's why it's there.
That said, I'd strongly avoid a Mini-14. Granted, they're not known for accuracy, I'm sure it's Improving, but I've shot one, and honestly, they're great for short range plinking, and that's about it.
A long-term, expandable, one-rifle .223 chassis pretty much sums up the AR-series. That said, I'd go AUG before AR, but I'm also a SteyrSnob... ;P
You mentioned hog-hunting out to 300 yards? Honestly, from perusing knowledge alone (never went hog-hunting), they're hardy little things that are best engaged at closer-range. A .223 may not have the punch to drop one at that range.
Again, never been hog hunting, only what I've read. Someone correct me if otherwise.
HOWEVER - Does a Mini-14 have the ability to pop two pins and swap out the bolt, barrel, BCG and all necessities with a 800-yd capable 6.5 barrel/setup, or even a .50cal? Didn't think so.
These are the advantages of going with an AR platform. Plus, if you build it, you are building it to YOUR specs, and like building a kit-car, you will know what every grind, click, tap, shift, and slide movement going on between face and fingers is. It's a whole new realm of "personal" with your gun.
When not shooting it? Tinker, save up for new parts, get all the tacticool accessories, wear a black outfit and watch your favorite action movie or zombie flick, hell maybe even act out a part or two in it!
Besides, there's a MASSIVE community (aka assistance) of AR people. Welcome to AmeRica. (spelled intentionally)