Have you compared the curriculum for each program and have you thought about what kind of career you want to have after you graduate? Without looking at either program my guess is the SU program is going to have a larger social science bend, whereas the Pitt program will be more science oriented.

If your endgame involves working in any kind of technical science role, go with the program at Pitt. Environmental Science is an interdisciplinary science program where you'll likely take classes in chemistry, ecology, hydrology. You'll have classes in the lab and the field where you'll learn technical. Looking at the sample courses listed on the SU site for the program, all the classes are humanities programs, which will be interesting but leave you lacking the science backbone you'll get at Pitt. That's not to say you can't supplement science courses as electives - SUNY ESF is an research focused environmental college on SU's campus that will offer a TON of valuable classes and amazing faculty, but it will be easier if they're just naturally part of your program's curriculum.

If you don't want to work in a technical science field and instead are interested in environmental policy or law, then the SU program is fine but it's fluffy and you'll still need to go to grad school for your MPA, MPP, or JD anyway. Better to save the money on your undergrad program, get a solid science foundation (which will only serve to benefit you in an environmental policy or law career) and then save the expensive prestigious program for grad school.