To each his own, but there are pros and cons all around the island.
East End:
Topside - There are a few good restaurants and a couple excellent ones, but no fast food. There are a several nice beaches at Rum Point, Colliers (Morritt's/Royal Reef Resorts), & East End public beach. Very little in the line of shopping. You need a rental car to get around as there is little or nothing within walking distance. No cruise ship traffic. No road traffic.
Diving - About 50 dive sites to choose among with 3 dive operators covering the area. The coral is definitely healthier. About even as far as larger critters. Shore diving is extremely limited with no dive shops at the few shore entry points. Sea conditions are rougher as it is the windward end of the island. No wreck dives.
West side: includes Georgetown, Seven Mile Beach, & West Bay)
Topside - Great beaches at Seven Mile Beach and Smith Cove. Lots more choice of restaurants including everything from fast food to gourmet. Lots of shopping in Georgetown and along Seven Mile Beach. You can get around via taxi and/or minibus and save renting a car. Real traffic jams with morning and evening rush hours; also clogged streets in Georgetown on cruise ships days.
Diving - About 30 dive operators covering about 150 sites. Several shops with on-site shore diving. Some of the sites (particularly those shore dives closest to the harbor) are showing significant coral degredation. A few wrecks within recreational depths. Sea conditions very calm on west side 95%+ of the time, with variable seas south and north according to the season.