I have no problems trading a Smith for a Ruger, depending, of course, on the models being traded.
However, older revolvers in nice shape are getting harder and harder to find, while the SP101 is going to be here for a while. I wouldn't trade.
And I'm a devout SP101 fan! I've had a couple in my carry rotation, I'm just "in between" them right now. My last one I traded for a Super Redhawk snub in .44, it was an offer I couldn't refuse.