Sometimes it is better not to have a choice at all
Getting a bit puzzled as I love both i) to solve the puzzle and then ii) put it on shelf (a-la collection) returning from time to time. So if there is choice, black or coloured?
In one handm, you never need to put stickers on couloured and they never un-stick when you solve it, on the other hand, black is classic and better for the shelf-life. Purchasing two variants seems even more stupid.