So for my brother-in-laws birthday I brewed a special, small batch of Imperial stout so he would feel special that only 1.5gallons of this stuff exists (hoping it tastes good

). In any case, I want to bottle them in 750ml bottles but can't decide between force carbing then bottling. or naturally carbonating them in bottle? In both situations I want to let them age a while before giving them to him. Any suggestions?