Some sound points raised here.
We needed extra space and were out priced of Kennington so looked for houses in FH, CP and W Norwood.
Moved to Gipsy Hill over 2 years ago primarly because a great house came up. Tbh though if this house was in FH or W Norwood we would of lived there.
Plus points for Gipsy Hill/CP. Good rail connections. In my view better than FH as reasonable time to Victoria (26 mins), Balham (N Line) aswell as London Bridge (26 mins). FH feels less well connected to central London but quicker to get out East, Canary Wharf etc.
Loads of parks in easy reach: CP Park, Norwood Park - stunning views btw, Westow Park and quick drive to Dulwich Park, Brockwell Park.
Leafy and not dominated by traffic.
Check catchment areas to schools -at the moment we are ok for Kingswood. Hope this remains until DS is ready to go to school.
CP shops are fab too - great deli's, loads of tasteful gift shops, an independent bookshop, antiques and some excellent restaurants/pubs. I never tire of going to Joannas a really good European place. The high st is not dominated by chains either which is refreshing.
All depends what your looking for op but good luck on your search.