Would also go for Grandison as Gorst feels a little 'remote' (by Battersea standards!). From Grandison you can get to Clapham South and Clapham Junction stations without problem. Gorst Rd is further away from both although close enough to Wandsworth Common which has fewer trains. Likely you'll have to change at Clapham Common anyway. Wandsworth Common is really lovely, which is the advantage of Gorst. Not that Clapham Common (closer to Grandison) isn't, but it's a little more 'rough round the edges'. It's bigger though. We used to have friends on Gorst who didn't get into Belleville nor Honeywell three years ago. Might be a consideration for you.