Whatever you have in your pocket will be fine. I realize this is "blade forums", but way too much emphasis is put on having the perfect tool for every possible scenario.
If you get stranded, you don't have a choice of what you'll have with you, so any blade will work. It won't be optimal for everything, but you'll make do. The smallish knife in the MT will work to build a fire and shelter, and the fix blade or folder will work for other non-knife related tasks. It really doesn't matter what you carry, just make sure you have access to some sort of cutting tool.
While I'm on a rant, the whole survival knife thing is overblown too. There is no such thing as a survival knife. If you are out backpacking or whatever and you get stranded or delayed due to weather or other problems, then you may be in a survival mode, but you are really just in an extended camping/bushcraft/hunting/fishing trip. Whatever blade you had with you at the time will be fine. You don't need to break out a special survival knife to continue.
On the other hand, if you were going about your daily non-bushcraft business and suddenly found yourself in a survival situation, then you wouldn't have your special survival knife with you either. It would be at home in your outdoor kit. You might have a MT or small pocket knife, and that's fine. That will work fine. No need for the 14" chopper or machete. If you actually thought that your regular routine might manifest itself into a full blown survival situation to the point where you thought ahead to pack your survival gear, then maybe you should think again about putting yourself in that much danger. You should probably stay home and plan for another day.
I never leave the house without a MT and folding lock blade, and I feel more than prepared bladewise for almost everything that nature or work can throw at me.
BB