Pete,
breaks at the weld are seldome, if ever, considered to be a problem with the band or the machinary. It's usually a welding fault that goes back to alignment, weld dressing or annealing. Cooks, Woodmizer and most all of the manufacturers are good about standing behind that.
The stock of the two companies' bands is probably quite similar and I would think that the tension would be pretty much the same.