I know they stopped making the SA in 223 and switched over to the mini but that being said the mini doesn’t seem to have the aftermarket support the SA does. Now I don’t know if that’s a big deal or not for you but personally I’d like to be able to get magazines from more then two companies and chassis/stock options.
Don’t know if you acted on this yet, but a consideration is mag length. If you wish to shoot heavies, the Mini’s mag length is pretty limiting.
SA would accommodate long for cartridge bullets with the current choices & open a world of options down the road, if you every decided to add to the barrel collection.