There is nothing wrong with the pistols you have. But, the Sig P226 9mm is one of the all time best combat pistols.
For myself, I'd rather own only the Sig, but I'm a gun snob that way. Owning guns isn't always about what is "best" or "makes sense." It's about finding that which moves your soul... as long as it's reliable, which the Sig is.
I intended to tell you to keep what you have, but I see I've written exactly the opposite. Well, there you go. Best compromise is sell the Taurus, keep the Smith, buy the Sig.