Richard,
I can't comment on the one from W-S.
But I have the Iwatani CB-TC-Pro you speak of (bought from the sushi chef/proprietor of my favorite sushi haunt years ago) and it works great. It fits securely on the fuel can, starts and stops easily, flame adjusts easily, and will crank out great creme brulees or sear Ahi. I'll also use it to roast a marshmallow for s'mores in a pinch. I see they are selling them on Amazon and are pretty well regarded.
Whichever you go for, you will find this a nice addition to you kitchen tool kit.
Bon Appetit
David