Well, until someone with some knowledge comes on (not me...I'm a beginner)...I'd like to point out that blades are often illegal...and so out of the scope of this thread topic.

'K.I.S.S.' It's about preferences....like empty hand MA...not one thing works equally well for everybody. The tessan, I think was pointed out for a reason: it is also a matter of....class...and degree of MA proficiency.