What is your goal? King might last you longer than shimano, but you will pay an order of magnitude more. As long as you're not buying a $5 Chinese/used ebay special (or powerspline) then with respect to intenal vs external, take your pick. Internal sealed square taper setups can save you more money relative to an external bearing setup. I've used several internal and external bb setups and have never had issues with any.

The cheapest, most durable setup will be serviceable, non-sealed bearing units. Notice I said cheapest and most durable. Otherwise, just buy what you can afford, build it, and ride it. If the winter kills your bb then buy a new one or overhaul it if possible.