Having seen Duncs' SDI/598 recently into a Pio screen, I would say that it is better.

As many will testify to now though, the SDI is fairly cheap and easy to do provided you own the SDI/DVI scaler already.

Whether or not you are getting the best out of your Pio with component is probably worth looking into. There are many tweaks to be done IIRC.

Rgds,
Nick