Which firm/bank to choose for S&T in Houston

I am looking to get an S&T internship in Houston next Summer and could do with some help.... Could anyone with relevant information tell me the advantages and disadvantages of choosing a bank, rather than one of the major oil firms like Chevron, Shell and BP.

What are the differences in pay and culture like for example? Anything info is helpful, I'm just trying to get an idea of where I want to apply to next year.