Triumph Laser is a crpaola bike sold at Wal Mart for some years. Made by Raleigh Canada, I think.

The Oxford is a low-end bike found at some multi-sport shops.

Fiori was a brand (i think) imported by norco. They made some nice MTbs and Road bikes. The first MTB I had was a Fiori San Remo, which was a good bike. I am not familiar witht he Potanza, but I would bet it is better quality than the Triumph and Laser.