Pick what you like/prefer. But honestly you would likely have to shoot me to get me off of GX at this point. I love the bigger range with single ring and couldn't imagine going back to a 2x. The two biggest improvements to bikes today are the 1x and the dropper post. All personal opinion of course.

I would also say, I have always preferred SRAM over Shimano for shifting. The push push made for a much stronger position on the bar for me. (I do know shimano allows for push push now. )