The title says it all ^^, I think Ryuga a better blader, well that's my opinion.
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L-drago and Pegasis

gingka is a bright, strong and confident blader and very powerful and has beaten ryuga in the past and other strong bladers e.g Kyoya.

ryuga is a strong competitor has defeated lots of strong bladers including gingka, and he is a very strong and powerful blader.

so they are both the same ( maybe )