I've used both ways with a bucket and with a carboy. I prefer the carboy for several reasons.
Honestly I like the carboy as well, glass is always better I believe. The only reason I dont use carboys more often is you have to be more careful with them and they are harder to clean.
Some of my buckets have some pretty dark stains on them, but I think they make the beer taste better...
Waterlogged, I have a couple of those 32L buckets, I use them for measuring mostly, but the are great fermenters as well... If they weren't so much more expensive than the buckets I get at Vinters I would have more of them...