Don't be fooled into believing thatmost sealed BBs are actually sealed. The sealed cartridge bearings used on most are made for things like electric motors, and the seals are dust seals, not weather seals (you don't run electric motors out in the weather). If you want a good all weather bearing, you want good baffles, with a gap between the exterior and bearing ears so water cannot wick across it, and most important you need a way to regrease.

I use an old SunTour Grease Gaurd BB, which is fairly weather resistant, but most important allows through the spindle grease injection, so I can replenish the grease, pushing out contaminated grease easily and often without disassembly.

As an alternate to a pricey serviceable BB, you might go the other route, buying the least expensive BB and considering it a sacrificial lamb, expecting to replace it more often, but it could still cost less in the long run.