The firestorm flipper on the top of the first one is, I presume, to aid self righting, but is mostly weight wasted in comparison to the second one.
*Coughhammercough*I like both of them. Do the spinners on the second one spin up or down?
unrealistic
I think SM is a pretty cool guy, eh builds unicycle-bots and doesn't afraid of anything
There are lots of ways you could lighten the side stabilisers.