Again a test on 30 meter early this morning. Same time (almost) same power, same antenna. It could be that there are more participants with WSPR than with Opera. So I can not conclude what the best software is. As a propagation tool is WSPR still the best, because of more active stations.
I see the possibility to make auto QSO's with Opera in the new version 1.2.1 How it works, I don't know yet. But Opera is still a beta version in development. So it can be a promise for hams. Try it yourself, you can download the program here.