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@Max
Confused by the question. Square taper is the original type of interface (bar cotter pins of course). Other (more modern) types are splined.
IMHO the best BB ever made is the UN71/72/73 series Shimano. They will almost last a lifetime, fit and forget with velvet smoothness and weight around 260 - 270g and cost typically £18. Superceded by later plastic cup models but you can still find them on ebay (from Germany too).