Re: battle of the trimetals
Trimetal hearts mostly smoke the same. Every Trimetal I've seen has the same gauge internals, with the exception of a small number of them that'll have wrong tubes in them.
That being said, KMs don't all smoke the same. I find the smaller hubbed KMs to have thinner tubes than larger hubbed ones, ie size 26 hub Trimetals vs size 30 hub New Butterfly (hub size, not shank size). It's not a perfect generalization because some hearts don't fit it but it's a pattern I've noticed.