You get plenty of selection at the bigger Fortress stores (
http://www.fortress.com.hk ) which are branded "Fortress World", but also at the Broadway chain and many other places. Many of the brands in HK are maintained by Gilman, and they have a shop themselves in Causeway Bay which has a smaller selection, but it might make sense to buy from there if they have what you want and you want to buy a maintenance contract. Price competition is pretty effective in HK, so you won't generally find huge differences in prices between the big shops. You'll probably get slightly better prices from smaller local stores, but personally I prefer to pay a small premium for the comfort of dealing with a big chain.
As to which brand, for fridges I don't think there's much to choose - it's more a matter of getting the size, colour etc that you want. Any of the international brands would be fine.
For washing machines it's really going to depend on the space you have. For heavy duty drying you generally need a separate stand-alone dryer - the combined washer-dryers aren't very effective for big loads. But if you're tight on space then I used to have a Thonmson Vedette washer-dryer which was one of the most effective combined machines I have ever used, and has an unusual (to me) design where the drum loads from the top (but still spins about a horizontal axis). The build quality was also very solid. I bought it from Gilman.
http://www.ghome.com.hk/frontpage.asp The current version of the mahcine I had seems to be this one.
http://www.ghome.com.hk/search_produ...productid=1139