Jynx92,
Have both, and without hesitation, an AR-15 is your best bet.
I've purchased used too, an would suggest an well regarded civilian manufacture to keep costs reasonable, these should have a chrome lined barrel, and would think a flat top or one with a removable carry handle would better since it sounds like a scope will be necessary for accurate long range shots advocated by the appleseed website.
ARs initially higher price is offset by the cost and availability of magazines, numerous standardized accessories, and most importantly, the out of the box accuracy.
Most mini-14s are very effected by barrel heat (rapid fire), and are probably fine for much shorter ranges than your website is proposing.
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