Montecs for two reasons....

1) Montecs are machined from a single piece of metal.... the NAPs are welded together.... doesn't take a machinist or an engineer to figure out which is stronger.... although its really almost academic

2) The montecs are made out of a harder steel that holds its edge better. Granted, it is slightly more difficult to resharpen, but that is worth the effort.

Both of them are a solid design though, and about as idiot proof a device as you'll find.