The Horseman and Para2 are very different knives.
I've had a Horseman and a half dozen Para2s of various steels and colors. The Para2s had uniformly awful edges, with terribly inconsistent edge angles. I've seen one Emerson, ever, with a poorly ground blade, the rest have been perfect. I also found the tips to be weak on the Military or Para2 because of the way it tapers all the way to the point.
The Para2 has a Compression lock which is a great design, the Emerson has a liner lock that is good enough.
The Para2 has phosphor bronze washers which are very smooth. The Horseman has nylatron washers which seem to last forever and are smooth, but a very different kind of smooth that requires a lot of wearing in.
They're pretty much the same size in the hand, but the Horseman is extremely secure thanks to the deep handguard. The Horseman has the wave, which I dislike but others love it.
I would choose the Horseman because they feel so stout in the hand and they take up very little space in the pocket because the blade shape is similar to the handle so it has a smaller footprint.
Edited to add:
I forgot to say that the steel difference is different. I extensively tested Spyderco S30V Vs. Emerson 154CM when removing carpet from my house. The Emerson stayed razor sharp for a long time then became unuseable while the Spyderco lost it's razor edge almost immediately but then stayed 'working sharp' for the rest of the project. I prefer the Emerson for EDC use where I have weekly access to a sharpening system. I guess I also prefer it for woods use, because I bring a pocket sharpener. I guess that if I used a knife all day long, instead of just every once in a while, I'd probably prefer S30V.