Actually if u notice, the 200D is degenerating into the larger size of low-end EOS. The 100D although very small, the shutter button is further away from the grip than the low-end EOS (and 200D), this makes operating the shutter with a more solid grip. So on those low-end EOS when you try to press the shutter, you will lose grip momentarily (n cause minute shakes enough to kill the shot). There's no such problem with higher-end EOS (less some of the xxD) cos the grips are larger.
Do try out the 200D before deciding whether you like the grip and feel. 100D operates like a mini large SLR with its solid grip and nice finger ridge. All the low-end EOS feel cheap and plasticky, same for the 200D.
The operating feel of the EOS-M is simply poor, like using a compact than a SLR. With the EOS-M EF adapter, they are hardly smaller than the 100D, more bulky in fact, and the 100D has a real finder. See the images to understand what I mean.
I cannot understand why can't Canon design a proper compact APS SLR. Look at the EOS-IX, it uses APS flim and the body depth is yet so slim. The Canon designers should open their eyes and look at their APS film SLRs. The EOS-M series is really a redundant spinoff, with all the mediocre lenses...else why would they promote the use of the adapter....
The compact m43 bodies are also really fragile. I have seen countless times those bodies just cracked apart like egg shells, and even the lower end lenses. And the rugged ones are so big that it moots the point to use m43.
Sorry to those who beg to differ, but since my film days I already know why the EOS SLRs are such a joy to operate. My 15 year-old EOS 10D still operates like a charm, built like a tank, and to date still delivers superb colors in low ISO 6.3mp.