How are you getting things into the airlock to begin with? Don't you have the cap on it?? What's in the airlock will get 'nasty' no matter what it's installed into. Doesn't matter if it's in a stopper in a carboy, or lid of a bucket.
I used the Better Bottle (and that type) of carboy for my batches (of beer) early on. I used the glass carboys for my mead batches. IME, buckets were a PITA top get the lid off, once closed properly. IF the one you're using is sucking back when you touch it, you're doing something wrong.
Personally, I use neither if at all possible. I have adapted/converted sanke kegs that I ferment in. MUCH happier with those. Two, stronger than you, handles built into each fermenter. 100% light tight, and zero chance of air getting through it. Zero chance of breaking, or melting. Plus, I don't need to put them into anything else to safely carry them (like many people do for either glass, or plastic, carboys. Chances are extremely high you'll NEVER see me use a bucket fermenter ever again. If I was given one, I'd find another use for it. Probably to catch grain from my mill.