not too much difference other than the obvious.
both are good guns that take a bit of tweaking to bring out their best.
the main negatives i have heard on the mini 30 is that many report the mini 30 will have trouble with surplus ammo. many break firing pins on the primers, or don't cycle it well. idk why ruger wouldn't build it to stand up to this ammo. of course some have claimed their 30 eats it all. mixed reviews i guess.
so for your uses, i'd go mini 14....although 223 isn't my favorite round right now (being next to impossible to find).