West Byfleet definitely better than Bushy Heath
I've done 18 months at West Byfleet and one of my mates is back there for a second time. It is an excellent area with fast trains to Waterloo in 20-25min and good schools. Socially a good little patch as well.
On the other side.....my brother is currently at Bushy Heath. Loads of houses are uninhabitable due to burst pipes, some also due to structural issues (cracks in the wall that you could put your hand through) and a general feeling that the areas needs a lot of money spending on it.
Of the two, West Byfleet wins hands down. Putney is also nice but houses are small and you need a letter from God to get on that list.
