I'm confused. Submariner of GMT2?

[Chris the Greek]

Hi I am a newbie. I am an expert on fine automobiles but sadly I dont have a massive knowledge on Rolex but about 2 months ago I decided I really wanted one and about a month ago I made a purchase, a 16610 LV (Green Bezel). I bought it brand new for £2800. I loved it. Sadly about a week ago I made a very bad decision and sold it to a friend for £3200, yes I made a small profit but now I have no Rolex again!!!!

So I need a new one. I am torn between Submariner and GMT2. This time I intened to keep for at least 2-3 years before selling and trading up into Daytonas hopefully.

Its quite embarrasing but I dont even know the difference between the GMT2 and the Submariner. They look the same to me. I know about the different water depths etc and the different bezel. But in terms of physical shape and dimensions is there a difference, they look identical and equally delicious to me.

I would like some advice on which to go for?

Also in terms of 2-3 years time resale values, which would hold a larger percentage of its original value? The GMT2 or the Sub black or Sub green?

Many thanks in advance for your replies.