No. The AR is far more accurate out of the box, even compared to the newer Mini 14/Ranch rifles.
Furthermore, the AR has far more potential for being accurized. There was a small family-owned company that was known for accurizing Mini-14s, and to get the works done and make it a 1 moa rifle you essentially paid for another rifle's worth of upgrades and labor. It's been years since I've been to their website and I'm not sure if they're even still in business. I wish I could recall their name. They sold a "stabilizing bar" which was supposed to improve accuracy of the older Mini-14s. I thought they looked cool because it gave the rifle more of a M-14 silhouette.
The Ranch rifle is fun, it's easier to store (takes up less room if it has the traditional stock on it), and has a beefy Garandesque action that's just plain cool. When you're tired of aluminum and plastic and want to shoot something made of wood and steel, then you're glad to have the Mini-14. If you want to shoot small groups, the AR has endless options re: barrels, free-floated handguards, and numerous other accurizing upgrades available. Plus, Joe Schmo is able to do what would traditionally need to be done by a gunsmith himself at home (except maybe pinning rear sights on a A2 upper, but even a lot of the guys here on this forum can or are able to do that). The correct solution of course is to have one of each if it's within your means. Another consideration favoring the AR, and this is minor (and possible debatable) point, is that the Ranch rifle beat the tar out of brass and slings them further than it can shoot the projectiles from which they originated. Now, I've never taken apart my Ranch rifle's bolt, and I'm not sure how it'd function if I trimmed the ejector spring, but I can easily tune my ejection pattern with my ARs (and do with all of them) to spit out empties just a couple of feet away from me. I learned that from one of Glen Zediker's books which brings up another point for the AR and that's the wealth of info available on improving accuracy with that platform.
Speaking from an accuracy standpoint, it's the AR. Aesthetically-speaking, and this is a matter of opinion, the Ranch rifle. In other words, if you want to be happy, marry yourself to the AR.