Answers: I have a Yoshi, it was sweet, massively powerful sounding, without overbearing.
Yoshi relies on their entitle to sell exhaust systems (I'm not saw they are not good, but other exhausts, sometimes preform better). I would see if you could locate dyno charts from both companies, and see if anyone else have the two exhausts you mentioned, to see which sound you approaching better.
I had an Akrapovic exhaust on my Kawi, and it sounded EXCELLENT!
both are dutiful pipes, check dyno charts and look at other makers (two brothers, muzzy, and others)
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