A tough decision - I have both and there are good arguments for using either.
The EE holder is much lighter -- 14 lbs with an empty can vs 26 lbs for the AT -- and on this kind of tire carrier (not an A frame) it makes a difference. Also, when there's no jerry can on the truck, the EE holder has a much slimmer profile. The holder is mounted low enough that denting hoods when parallel parking is a concern, and the AT holder would stick out all the time.
On the flip side, the AT is a lot stronger. The weak link on the EE holder when mounted like this would be the clasp. It's spot welded in several places, but probably not enough. Two bolts on either side of the clasp (4 total) could be added to strengthen it. Also, a cinch or ratchet strap could be used to take the weight off the clasp - something like this:
The downside to straps is they relax when wet. The ratchet strap might be the better option between the two.
As for mounting the can onto the EE holder, it _would_ be a little more difficult / tricky. Hard to say before I've actually tried it, but the basket part of the holder is sized perfectly, and once I lay the butt of the can in the socket, it shouldn't be too difficult to slide the ratchet strap back on and close the metal strapping.
There's also a small fitment issue with the AT holder. I would have to either get a straight metal strap from AT and bend it myself to fit a Wedco better, or cut & shape one myself. Some sticky closed-cell foam padding would take care of fitment in the holder itself, so that's fine, but to avoid rattling from the metal strap, I would need to replace the original.
So, I'm leaning towards the EE... What do you think?
js.