Mini-14 vs AR-15 not as I own both and both fill a niche. Being one of the older generation I do love my weapons of steel and wood. However, I am a realist and like my Matel weapons too. Realistically, I keep both for different purposes. The Mini is my truck gun and it was designed to be a 2 to 3 moa weapon from the beginning, very similiar to the M-1 Garand and the M-14. The AR platform can be built to a degree of accuracy that the old war horses could only be hopeful of attaining with several modifications and lots of TLC.
To bash one and praise the other reminds me of the 1911 vs the plastic pistol vs the revolver. Enjoy each for what they are and become proficient in the manual of arms for the weapon of your choice. I often comment to everyone who asks me to help them to decide on a new weapon; pick the one that looks and feels right. Then practice, practice, practice. Have fun