I use the cheapest I can find.
Not that I've ever seen the need to use any on 'second quality' kit, just came in handy when I acquired a load of old flat pack stuff that had sat in someone's shed for a decade at an auction once.
I use the cheapest car body filler I can buy when I convert my Paynes poly nucs into 8 frames removing the feeder .... works for me. The bees have never complained. I've used decorators caulk as well to fill waxmoth damage in poly hives.