Originally Posted by Boss Moniker
Square tapers are the most common, and something like 99% of the tapers for any square taper set will match.
Like el twe says, more like a 60-40 shot instead of 99%. ISO is on Campy, Miche, Paul, and some others. JIS is most of your Japanese brands (Shimano, Sugino, Hatta, etc.).
Originally Posted by Boss Moniker
There are Octalink and ISIS BBs that interface only with the respective cranks, and these are stiffer for more power transfer, but everything is more expensive.
Actually it's about the same price, but unless you get track specific parts, there is a lot less variation in spindle length (usually just one or two) for each BB, so getting your chainline right is a lot harder.