Definitely talk to as many people from each program as possible- you're gonna be spending the next few years with them, so the better feel you get for the department, the better idea you'll get of if you'll fit in and get along with those in the department. If you're honest and open about questions you have, you won't come across in a bad way, you'll come across as conscientious. Rankings shift year by year, so try and pick the program that is more consistently churning out students and papers. Also, unless you're dead set on your area of study, consider what you would do if you changed your mind- does your program have other areas that you could switch to, or would you be locked into your initial choice?