I have experience with both BBs. And I can safely say that Bastards performs much better than Madbull. They don't misfeed like the madbull does on many guns(All madbull BBs I had misfed, even the newest version).
By the way, all BBs(Except for marurzen SGM 0.29g) will leave a residue on both the inner barrel and hop up rubber over time. Regular cleaning is good for all guns using any type of BBs.
Hope that helps
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