For me at least, toe clips or clipless does not gain me the ability to add power by pulling up, they just keep my feet firmly on the pedal so that my trailing leg can take its weight off the pedal without slipping off. The trailing leg isn't helping, it's just getting out of the way.
With platforms, you need to maintain a little pressure on the trailing foot to keep the foot on the pedal.
For me it doesn't matter if I'm using toe clips or clipless, either works OK for me.
I've never fallen due to either clipless or toe clips but that's because I have good control of the bike during the summer.

However, in the winter I'm just as happy to go to no clips at all because if I'm really wallowing through deep rutted snow, the bike spins out from under me fairly often and I want my foot to just go straight to the ground. Last time I rode, on Monday, I probably would have fallen a half dozen times in clips or clipless, because I was wallowing through probably 10 inches of mushed-up crap that was badly rutted, and the bike just went out from under me with no warning several times. So for me, in the winter, plain old platforms are the way to go.