I wear 5.10 Impact VXi (2 pairs, and they haven't fallen apart yet), and the grippiest pedals I've ever used are the OneUp Alloy on my Capra.
2nd grippiest: Superstar Nano X (the larger alloy pedal).
On my Rise I'm currently running my 5 year old Hopes that I used to run on my Jeffsy, and they seem to be pretty indestructible. Even the pins last ages (finally replaced 3 pins before putting on the Rise). They don't bend, they just wear/grind down after multiple rock strikes. But when they do wear down, just be careful when you're pushing the bike as the edges are then sharp and can catch your calves/shins if you're not careful (ouch!).
However - the Hope's aren't actually all that grippy - prob due to the fatter pins. Was fine on the Jeffsy, but the Rise needs grippier pedals. Interested to read above about the Burgtec pins fitting (which ones?), and I've also read that removing the 2 spindle pins also helps, so might try that as well.
The Rise came with some new Burgtec composites. Not impressed at all. Not very grippy and the pins bent at the first hint of a rock strike, further decreasing their grip. Bent pins replaced and now the pedals are in the spares box. I know I said the Hope's weren't that grippy, but they're still way grippier than the Burgtecs!
At some point (when funds have recovered!) I'll get another pair of the OneUp Alloy fitted. Would use what I have, but they're green, and my Rise is blue - can't have mis-matched colours!
Had to straighten them out with pliers first before replacing. I've come across cheese harder than these!
I don't think the actual shape helps as there's no 'ramp' to help deflect off rocks.