Since beauty is a subjective thing, I think the RD500 is one of the best looking bikes ever! Stuck in the eighties me...
As for the RG being better, I think all I've ever read says it is, but I think it's a bit ugly, and is a Suzuki...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball