PROS:- slightly less expensive than an AR
- more politically-correct than an AR (admittedly, some will not see this as a "PRO"
)
- legal in a few places ARs are not (I believe this is the case - the AWB-state foks can correct me if not)
CONS:- less accurate (generally) than an AR
- less versatile (configurations, accessories, etc) than an AR
- magazine cost/availability/reliability
There are more that could be added to either list, but these are the main ones IMHO that usually dictate the buy/no-buy choice for most people.
FWIW, I have had a few Minis come through my hands over the years, currently have one that I kept but rarely shoot - in contrast, I have 2-dozen ARs in various calibers and configurations & shoot them more than any of my other firearms. YMMV, of course.