nathann wrote:With fixed gears, the pedals keep moving even around corners so it's more likely to hit the ground. I think.
Also might have something to do with bottom bracket height but I don't even know so yeah.
This. More info in that section of SB's website I linked previously. It's quite dangerous if you're going fast and can't regain control.
I've never heard of BB height being a factor, probably because it is pretty standard and not something you can modify yourself. You can reduce the risk of pedal strike by having narrower pedals (I did this and it helped) and shorter crank arms. This will give you more pedal clearance from the ground. You also have to be aware of the issue while you are riding, especially while you are going around sharp corners.
Krank if you want to ask about different types of fixies may I suggest that you post in the appropriate thread, or create your own. This thread is supposed to be about buying pre-made single speed bikes and so a discussion about better options for a fixie isn't appropriate. We've already gone way off topic with all this discussion on pedal strike.