The USAF survival knife is not bad, but it is a bit overbuilt IMHO. In the sense of the blade being slightly too thick for optimal cutting performance.

The Ontario Spec Plus version is worse still. I bought one online a while ago - sure looked nice but the blade is even thicker than the original USAF issue. Even with heavy grinding I was not able to reduce the blade profile to an acceptable level so the knife was pretty much useless as a cutting tool. It was outperformed many, many times by a cheap Mora and even by the genuine KABAR. Which, while fairly strong, is still not too thick for serious cutting.

The sawback is not really a saw. IIRC it was designed to saw through plexiglas. Whether that works I can't say because I've never tried. On wood it's pretty much useless except for making shallow grooves (might be useful at making traps or snares, but that's about it in a survival situation). On metal it's worse than useless. Simply put, the blade is way too thick for a saw so a real folding saw would do a far better job.

IMHO a sawback has no place on a knife but then again, your mileage may vary.