Franko 10/14 is good there that is what I keep in the saw most of the time. I don't change it unless I cut some pretty thin stuff, or will be cutting a bit of heavier stuff. Then I have a 6tpi I use.
Not sure who it was that stated the blade thickness and height keep it from cutting true but my saw cuts as true as I would expect from a band saw.
My vote is for bi metal but I also cut stuff like SS, stress proof, some coil spring steel I got at the scrap yard.
Mark