I was in the same boat as you. MG was my first pick and SW was second. I tried to negotiate a deal for 6% off on a MG and the dealer was not doing it but 30 miles away a dealer got a SW and did the 6% off so I ended up with white. While white was my originally my second choice I actually prefer it now and that is not me just trying to convince myself
I had a Dark Grey VW GTI that I traded in and I'm glad to have a color change. With a TEP, buy whichever is on the lot or whichever has the better deal. You really won't care once you are behind the wheel and enjoying it. Go to the Grey thread and you will love it. Go to the white thread and you will love it.