If it's the HWS system, and if 4D counts, Duo does better than Basalt, MF Duo Aquario BD145RDF does a little better, in terms of defense.
There really is no strongest, it would have to be decided on every factor, way to win, stadium, quality of beyblade etc
My Cho-Z Reaper Deathscyther .12.Cr concept render, click below to see!
No I don't plan on doing more yet.
I should probably go back to making fan custom Zero G beyblade concepts again