I have both ... One of the " Old School " that you have Disston ... and one of newer ones that is made by some guy here in Oz .
I prefer the newer one because it picks up every fin ... its easier to get in ... and I am able to include it in my tool roll.
Maybe I am a bit anal ... but I do my headers ... clean out with a bottle brush ... and apply anti seize twice a year . Its amazing how much better the bike sounds and riders with a bit of the carbon cleaned out does.
BMW R100LT 93 BMW R100RS 91 BMW K1100LT SE 94 76 R90S