Correct me if I'm wrong, but aren't the night tube jobs at New Cross Gate in a separate link that you have to volunteer for?
SE is a 35hr 4 day week, sundays inside, maximum job length 9hrs 15m (which is a long time on intensive work).
Victoria used to be classed as a "non residential" depot and had a taxi agreement and reasonable start/finish times, however that is now out the window and they have 04xx starts and 01xx finishes too, plus some nights. The fact that management did this and the union were complicit in it speaks volumes.
Vic used to sign only the Chatham stuff and go all the way to the coast, having some pretty decent work. A few years ago they signed Charing Cross and Cannon Street and everything in the DOO metro area making the bottom link jobs pretty grim. Mainline wise they only go to Canterbury via Maidstone East and Faversham I believe - however the vast bulk of this work is top link. Once thameslink start running on the Maidstone East line you have to wonder how much of this work Vic will retain.
Also, if SE metro does go over to TFL (which is very much on the cards), then you'll be stuck doing ARL work for less money, with the chances of all night running on Orpy-Vics being pretty high anyway.
Travel facilities are another factor to consider.... with SE you get free SE and GTR plus the 75% priv card (after 6 months). With TFL you get free TFL tube, buses etc plus the 75% priv. Presumably you also get other Arriva TOCs free, but not sure about that. If you live in London the free TFL for you and your family is a big consideration. SE staff pay full price on the tube and bus.