i've had both the sage 2 and the para2 (s35vn & m390). A few thoughts.
I love the cleanliness and crispness of the sage 2. It's been compared to sebenzas (poor man's 'benza) for its TI slabs, elegant design points, and close machine tolerances. It really feels crisp and clean. The wire pocket clip is a win, in my book. Effective, stout, deeper carry than the stock PM2 clip. The overall thinness of the knife, along with being a bit shorter than the PM2, makes it pretty much disappear in the pocket. I find the blade shape to be a bit lack luster next to the PM2, which has a more acute tip and better belly (IMO), but its quite functional in its own right. Deployment is smooth, but not as buttery and quick as the pm2. Framelock is nice, however care must be taken not to overextend the lock bar due to the absence of a "hinderer style" lock bar stabilizer. That adds up to make the sage a bit more touchy of the two, if you will - it requires more attention than the pm2 in this regard.
The pm2 isn't as clean and neat from the design standpoint - the G10 is grippier though, and the ample handle size makes it easier to get a good variety of holds on it in a way that the sage didn't for me. The scales also don't show the wear and tear that titanium does, so you won't be worried about scratching it up. The compression lock is very easy to use right or left handed (i'm lefty), and the absence of lock bar pressure on the blade on opening and closing means that the blade swings freely. That means its a cinch to flick open and closed one handed, which is a win for me. The blade shape feels more utilitarian to me, and has the added benefit of extra cutting edge. The pocket clip leaves something to be desired, but there are aftermarket options that address that. The pocket clip is also 4 way positionable, as opposed to the exclusively tip-up carry option on the sage. There's also a plethora of styles and bladesteels offered for the PM2, so if you're a steel freak you can scratch that itch quite well.
In the end, I prefer the PM2 - the ease of opening, the bladeshape and steel offerings, as well as the ergonomics make it an every day staple in my pockets. Whichever you choose, you can't go wrong, as they're both great blades from a winning company. I hope my thoughts help, and good luck choosing!