At the risk of stating the obvious, everyone’s gear requirements will differ – it depends on your fitness and where you ride, and whether the bike is a 26 or 29er, so I’d suggest asking what others ride isn’t a very good way of choosing what’s right for you.
Better to work out your own ratios using a gear calculator like this one Sheldon’s Gear Calculator where you can pick what your top and bottom gears will be, and how much overlap you want.
Things to watch out for – a bigger difference in teeth between your front rings will give you a greater range, and less overlap, but go too far and shifting starts to get a bit clunky. My experience has been that a 10T difference (like 22/32) will be smooth as, a 12T difference is still fine, but by a 14T difference it’s starting to get a bit clunky (unless you have specifically designed rings and FD like the SLX M665).