I'm a TH 9, just started on Skull Walls, most of my defenses are 1 lvl from max, most of my troops (excluding DE) are maxed, except Archers, which I choose not to waste elixir upgrading, cuz... the upgrade sux. My personal choice is that I'm not going up to TH 10 for a looooooooooong time. Until all my troops and buildings are maxed (even archers), all my walls are lego, and my heroes are as far as I can go with only 2 drills. I upgraded to TH 9 way too fast, and don't want to repeat that experience. I'm only at like 127m GG, so I'm not gonna rush it.
I think for some players, they would rather have a weak 10 than a strong 9. I've seen several 10's with wooden walls, and infernos... ♥♥♥... lol