What color if iPhone 7 plus should I get?

I don't like the rose gold one.

Pick the color you like the best, get a clear case if you really like seeing the color, and get cases in other colors if you want to change up the look from time to time (a waste of time and money in my world), but some people like to do that.

You have to remember, that other people don't really look at you when you are holding or using your phone. And if they do 99.99% of the don't even notice the color of the phone, they just see someone using a phone, so the phone color is ONLY for you. You know what you like, that is what you should go for.

Go for whatever one you like the most. You should really be using a case so the colour shouldn't matter as it will be covered up.

Jet Black

I'm another who say that you will only see that color out the Power Girl style apple logo window on your protective cover. If all the same price I would get space grey because that is what color my wife who uses iPhone likes.
I would also get SIM-free if I was paying full price even if it was in installments