Science

In terms of salary just after B.Sc, they are almost equivalent. But in my opinion CS definitely has the edge because of wider range of opportunities and job available. With CS you can also enter into the highly lucrative area of data mining (salaries in crores if you go abroad). You can go for higher education M.Sc PhD. IT graduates also earn a lot (similar to CS) but the problem is many Indian universities don't take IT degree for higher education. Research fields are limited (they are wide of course but I am talking w.r.t. CS). Also thanks to the stigma attached to technical degrees IT B.Tech are more preferred vis. a vis IT B.Sc (same is the case with CS but atleast you can go for M.Tech and make up for that if that causes problem)
As for course work IT is easier. For most part IT and CS courses are similar but CS involves more maths as compared to IT. So if you are a bit uncomfortable with maths, take IT. In the end it's your choice. Hard work and determination can take you to the moon even if you come with an obscure degree like B.Tech in food storage. What I said above was keeping in mind the general trend (the averages). But exceptions are always there.