MOST compasses do one very simple thing. They all point to magnetic north.Some do not. Buying one just because you see it listed or displayed in other kits is what keeps compass makers in business. If you're bugging out, do you plan on joining all these other buggees trampling this year's corn crop and doing Ninja rolls past overpasses?
Now for wilderness survival, assuming you need to navigate from point A to point B instead of staying put and signalling, a capable compass for hiking by map will serve your needs.
What you want, before you buy a compass, is a book about compass use.I recommend Be Expert With MAP & COMPASS by Bjorn Kjellstrom.