Nor Mios, nor Dragonfly are all-terrain - and there is no stroller this light or compact that will actually be all-terrain.
That being said, and also counting on the wheels being small and not chunky for big bumps or holes in the sidewalks, I did use the Mios on grass and bumps rather regularly, and when taking the wheels size into consideration, I was actually very happy with the suspension and the build, sturdiness of the frame. So if you really need something this small while reclinable and for bumpy roads, the Mios is good enough, but again, you HAVE TO count on the small wheels being just that- small, so you will need to lift them over large bumps or holes.
The Dragonfly is super light and just as non-terrain-capable, personally I would not take that one for anything more than lighter urban use, the front wheels are a tad thin and also not that sprung. It is a nice model but I don't find it suitable for terrain much (or at all).
You can also look at the Cybex Eezy S-Twist+² because or the wheel size - or go for larger wheeled, forward-facing-only pushchairs like the Oyster Zero Gravity (still not an all-terrainbeast though, the low weight is simply not for all terrain much).