I own a Guardian .380, but not a .32 or a Rohrbaugh (I'll likely order one at some point). I have shot the .32.
The .380 is about the same size as the Rohrbaugh but a bit heavier. It pretty much defines the size limit for comfortable, discreet pocket carry. I can, and have, carried a Glock 26 in a pocket, but not without frequently wearing white spots and holes in my pants.
I buy all my pants - jeans and dress slacks - relaxed fit, and this makes a huge difference for pocket carry.
I suspect that one who owned the Rohrbaugh would prefer to carry it to the .32 most of the time, but there will definitely be times when the smaller size of the .32 would be appreciated.
If you own both, you might even carry the .32 to back up the Rohrbaugh, as I occasionally carry a Kel-Tec .32 or North American Arms .22 lr. mini revolver to back up my Guardian .380.
My .380 has Novak tritium sights, NAA custom shop stippling on the frontstrap and backstrap, and a Teddy Jacobson action job, all of which I highly recommend, although the gutter snipe sight may make more sense on the smaller .32. Teddy reduced my trigger pull from 9.5 to 6.5 lb. without cutting springs or otherwise compromising the function of the gun.
The best front pocket holster I have seen for a true pocket gun is Ron Graham's Maverick. For something larger like a Glock 26, Kramer's pocket holster works well.