I've tried both, and I realized na magkaiba sila and mahirap i-compare. I tired both a vintage TS-9 and YJM on my tube amp. the TS-9 will ofcourse give you everything that you'll expect from a ts-9. the YJM wont give you much OD kapag clean yung amp mo. It's a pre-amp OD. kapag yung YJM ay kinabit mo sa overdriven channel ng isang amp, sobrang ganda ng tunog; or better yet kabit mo after a ts9 or a bd2 or even a ds1. I've tried all these and i think effective ang YJM kapag overdriven na yung amp. It adds color to your OD.