One of the main visual changes from old to new was from numerals to batons. This distinguished the precious metal models from the SS and TT. There are also different dial colours, and of course the rubber vs croc.
Personally I prefer the old model, and had the rose gold with chocolate dial, and bought a Rubber B (from Kerry) which I think dressed it down, but nice to have the choice of both.
There were far better discounts available on the older model when I was looking (a year back), so in my opinion is a better choice if concerned with resale. The fact that it looks visually different to the SS given the numerals is also a plus, and should help resale.