Personal favourite is the Brunton 15TDCL mirrored compass. It means I have a nice compass, that has all the standard features, like magnifying glass for topo lines, UTM grid measurement divider things...
, declination adjustability, and it means I don't need a slope meter, with the bottom sighting hole, you can turn the compass sideways and look through that sighting hole at what you need your slope to, and then look at your slope indicator to see where you are at. Plus, I have a ton of experience with these from my Outdoor Rec. and Conservation uni courses.
