I've lived in both and like them both quite a lot. Be prepared that for a good deal, you will most likely find older buildings and a local neighborhood. I like these points, but not everyone does.
Sheung Wan (varies depending on if you're close to the harbor or Hollywood Rd)
Lots of transportation options - multiple trams run along Des Voeux road from SW to the end of the Island, subway station, lots of buses. Close to Macau Ferry terminal. Quick walk in covered walkway from there all the way to Central.
Restaurants - increasingly more western restaurants in SW, think there are just more foreigners moving in. Good Chiu Chow restaurants around too. Good options and for more upscale, short trip to Central/Soho.
Supermarkets - there are several within walking distance. A new Park-n-Shop on Des Voeux and its sister store, International, on Queen's Road. There's a Welcome right next door.
Living - cost noticably lower than Central/mid-levels/happy valley although rent has been going up in SW this past year. Last year, I had a place for 11K w/ roof, but moved after landlord raised the rent. Above the wet market on Queen's Road is the SW Athletic Center. With a HK ID, you can use their squash, badminton courts for cheap.
Also, easy Transportation options, but it is somewhat quieter than SW (except at night when all thing close at SW) unless you live on King's Road (quite noisy with the buses going by), cost of living is a little higher but decent places can still be found, lots of restaurants and plenty of grocery stores. Victoria Park is a plus, because the green space is so hard to find in HK.
There is a swimming pool in the park that is open in the summer, tennis courts, jogging track.
Given that you work at CB, I'd choose Tin Hau. SW's convenience to Central was the best perk for me.