IMO the advantage in the new BB style is for the manufacturer- not the end user. There is the marketing hype, but also manufacturing costs are less than the "old stuff." For the end user the advantage would be less weight, and lower costs for aftermarket or replacement parts. Ain't nothing wrong with the old square taper, but it's getting expensive, somewhat due to scarcity. Price a Phil bottom bracket and a set of quality cranks. Adds up quick. If weight isn't an issue you can do a UN54, and choose from the huge supply of used square taper cranksets out there. Makes the newer stuff look pretty attractive though.