I've been in Bentleigh for over two years now and have to say I love the location. Close to Southland and Chadstone shopping centres, great restaurants in Bentleigh and surrounding suburbs, beach, and city. Great schools and community spirit.
Camberwell does have a much better shopping district, you have the Rivoli cinemas, the Well shopping center and overall a much larger shopping precinct. Camberwell is also very close to the private schools if you need it as well as being central to transport with the train station and trams nearby.