I havent used many Mugen bushings but i think the difference is related to preference in drivablity and how you want you car to feel and not which is better or worse.
Personally i love the feel that the ES bushings have given my EG. Very tight, sturdy, but a downside harsher ride which people dont like. On the flipside the Mugen ones little softer, maybe not as tight or sturdy ride/feel but please the greater honda community as they more suited for a daily driver.
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