okay... I'm talkin out of my ass if you didn't figure it out. Get either one. The price is the same or no more than $15 different I went with HOWE back in the day when it was still unsure whether they would have fitment issues and that has long been resolved. I have never heard of any problems with one or the other. Unless they did change the style/size of the KOYO, I believe I am correct in that the HOWE is a little bigger. Someone please chime in but I remember something like 2.8 gal capacity (KOYO) vs 3.2 gal (HOWE) or something. I can't remember and that figure is out of my butt too.
good luck on your decision. either one will be a good one over stock.