Frankly Speaking each and every college is same. The only difference is Fanshawe is in London, Ontario whereas Seneca is in in Toronto. So if you want to get more options in searching Jobs better to select Seneca because London is a small city with less Job options. Needless to say Toronto is better as compare to London.
I've studied in Fanshawe and while the college is huge, there aren't many opportunities for part-time work in London, Ontario. Also, some of the professors at Fanshawe are super racist.