I bought a Wacom tablet, intending to use it with SU. I couldn’t find a way of configuring it to work well, and since I don’t use it for 2D drawing, it’s been gathering dust since. Not recommended for SU, in my view too.
You might find a gaming mouse with multiple buttons useful for SU. They are mostly for right handers, though. Although I’m right handed, I use my scroll mouse left handed, as I’ve developed RSI and trigger thumb in my right hand, so haven’t tried one myself.