The thing with the E13 and MRP G2 isn't the taco, it's the guides themselves that aren't very good….
Best guide is the Straitline one, hands down.
Funny, I found the opposite to be true for me. The LG1+ was flawless in the 2 years I used it - easy to set up with not a single chain issue.
Then I switched to a Mini G2 SL (frame fit issues) and the lower roller seemed to have a lot more drag. Maybe I just noticed it more having spent lots more time on the XC bike. Or maybe it needed more time to break in. I might use this one again without the lower roller.
So then I switched to the Straitline and it was quieter/smoother, but its less than ideal if you're running less than a 36t ring. A 34t might be OK but with a 32t there is enough vertical space in the top guide for the chain can bounce. So I've had a couple minor jams. Still a really good guide but something to keep in mind. On a 'taco' style guide, you can set everything really tight assuming you've got the right backplate.
But to answer the 'taco' questions - yeah, they take a beating and they supposedly have break-away bolts to prevent frame damage. No idea what would happen on a hard concrete ledge impact though.