S&T. I'm a pure maths student, not CS or finance, which is where an increasing number of the S&T pool is being drawn from.
For me, it's less about money and more about the institutional leverage implicit in bulge bracket firms. I'm content when I can think about big, creative problems and if that translates into less money for me personally that's alright. A large problem, in my opinion, with S&T desks is the relatively recent adoption of the IBD mentality of moving up the invisible hierarchy by working at x for two years, y for one year, getting z graduate degree, etc.