Tear is pretty awesome on Maemo4. Gmail is very usable on Tear when compared to Opera on Maemo4. Also, Tear is much better integrated into the OS (hardware buttons, associations) compared to Opera.

I think Opera has an edge in speed and also on click dragging. Click dragging in Tear always results in a click where you dragged. This doesn't happen in Opera. And Opera's interface is simply gorgeous. It's really nice to look at.

I have both installed and use each for different sites.

Frank