I use carboys typically for beer, use buckets for primary ferment of meads/carboys for secondary of meads - I use the buckets for mead beings as I muck around more with meads than I do with beers, doing staggered nutrient additions, adding fruits/spices/vegetables/whatever.....beers I pretty much set and forget, other than maybe adding oak....and I don't brew much beer anymore anyway, beings as my small city now has a microbrewery/taproom, a taproom/restaurant with over 40 taps, 90+% of it good craft beer (hate that term), and a bottle store/taproom that has 22 taps, all of it good (well, at least all of it not BMC swill...sampled a vanilla cream ale that tasted like shat...in my world, vanilla goes into baked good/desserts/ice cream, and not in beer...it was wretched