I own 3 taurus and have owned 7 Rossis and the Taurus is consistently more accurate and a better trigger. 2 of my 3 Tauri compare well with ANY out of the box revolver ever built by Smith and Wesson. The 3" M66 is an 80s gun with the older DA hammer block action and doesn't have quite the good trigger that my Smiths and my newer Tauri have. My M68 Rossi's DA is a little stiffer than most Smiths and Tauri, but is smooth and the SA is pretty awesome.
My 4" M66 Taurus is more accurate than my old M971 Rossi, my old M19 Smith and Wesson, my old M10 Smith and Wesson, and MUCH more accurate with .38 than my old Ruger Security Six. It and the M10 stayed with me, the others are gone. That 4" M66, an early 90s gun, transfer bar trigger, but no lock or MIM parts, is simply amazing with it's tight little 25 yard groups. I can shoot 1" regularly with it with .357 OR .38 at 25 yards off bags and if I had a ransom rest or a scope on it, I'm betting I could HALF that. Amazing gun. I use the gun for outdoor carry, hiking and such where I can wear it openly on a belt. I sometimes carry the 3" IWB, carries concealed IWB a little better than the 4" gun.
I don't own a post Interarms Rossi and never have. I will if I want one, though, as I only have quality Taurus revolvers and won't let that stop me from a Rossi if I so desire. From what I'm hearing, they're even greatly improving their customer service and both are warrantied for life.