You probably don't have much choice, depends which area you live, PCCW can provide all three:
Internet access: Netvigator (brand)
Land phone: PCCW
TV: Now Broadband (TV over IP: subsidiary).
But only cable TV might be available in the New Territories, whilst Cyberport has its own high speed internet access, HKBN can be an alternative elsewhere but is oversold on bandwidth.
PCCW I think has a monopoly on landlines, hence being the second largest company in HK. It also means they employ a lot of retards on sales and support, so be careful and try not to change too many things.
Be aware advertised prices are inflated, especially Now TV's built in subscription service. You can make significant savings ordering in person, and after I think two years of service.
Biggest warning is to remember to cancel all the free promotion crap they bundle on packages. If you make any plan changes, re-check to see if the free promotions options are re-activated: crazy stuff like netvigator webmail anti-virus protection.