My favourite is 483, which currently has the highest votes.
It's a shame that it doesn't have any "cleverness" to it, like the depiction of an edge. I notice that many of the designers have misunderstood what "edge" means in this context. It doesn't mean a cliff edge—rather it means a competitive advantage, which is correctly depicted (in my opinion) in #490 and #298. However, those logos just intuitively look worse in my opinion. If you really wanted the logo to communicate a competitive advantage, Alexandru might be able to have more attempts at that. (He's my favourite designer of the bunch.)