If you find blades with more teeth (eg 14 tpi instead of 10) that's probably an advantage for our use.
Big teeth cut faster, but only if they don't catch on the material, which tends to break the blade. You should always have at least 1 or preferablyy 2 teeth in the thickness of the metal, which means a 10tpi blade shouldn't be used on material less than 2.5mm thick. In the case of tube, it's the wall thickness that matters, not the tube diameter.