I went with a NAPA unit with lifetime warranty some 7-8 years ago. Spectra Premium at the time, not sure what's up now.
It's nothing special except that it's quite thick, a very deep 3 core and works fine. Plastic tanks.
I went this route cause my original was trashed and I knew leaking was to be expected some day, hence NAPA and lifetime warranty. It was a leaker out of the box, but I didn't have time to exchange it for a couple years.
I finally got around to it and the next one leaked a little also. Dye and an ultraviolet flashlight proved that after another while of driving it. 3rd try has been solid, been running for about 4 years but I also don't drive a lot with my rig.
I can tell you NAPA wasn't super happy about those returns but they did it and it was all free.
Whatever you do, use good coolant! I'm sure you've got that covered with your line of work.
The reason I did the NAPA route is because they are all over, the core was much thicker than Orielly, lifetime warranty, and WHEN it failed, I could replace it locally for free. And drive 10 mins to get there. You can't do most of that with a Champion!