I have been through the same quandry recently. I decided to go with Algoa in PE as they were the most responsive to my requirements. I have done much research on the area and PE sounds like it's got a real good mix of things to do, good restaurants, cheap beer, great beeches etc etc. I too have to consider night life as I am travelling with my partner who will want other things than flying.
When I considered Good Hope, it struch me that the school was quite far out from Cape Town so it may not be as convenient on a daily basis? At the end of the day it's down to personal choice......
I am actually heading out to SA on the 30th of this month to hour build as I have completed my PPL in the UK. I'll post on my return to let you know of my experiences.
Good luck whichever way you choose to go.