The PT MBA is somewhat different than the Full time in terms of how it is setup, your load, recruiting potential and options.
If you are planning to stay with your current employer after graduation, then location does not matter. If not, then you may want to consider a few aspects - not critical but you would be leaving all your friends/network in Chicago. Plenty move to Bay area from Booth though.
Also, how does the guy attending Haas know what Booth is like? I think it is important to ask him/her why they feel that way and what makes them think so? (There are plenty of report of disgruntled stidents out there pretty much across all top schools. It seems this person has not had their expectations set properly. That would be important for you to do. Nothing is deal, not even HBS or being a partner at Blackstone or Goldman.
The main difference between programs, seems the size of the program.... that's about it. if it makes you feel better, Haas is ranked as #1 PT program by US news
but I would not put much weight on that since few know PT rankings.