In 2003 Mann Edge Tool sold out and Collins manufacture moved to Mexico. Quality dropped again. I've found the recently sold Collins stuff to be misshapen and have poor/spotty heat treat. The metal itself is suspect.
So to compare with True Temper we need to look at what era the axes were made. Most Collins axes found on the used market today are from the Mann era, have flat cheeks and moderately good steel - maybe equivalent to Woodslasher steel (but with crappy flat cheeks). Most of the True Temper stuff out there has both better steel and better form than most of the Collins stuff out there.
But you can't make a blanket statement about which maker is 'better' because there are too many variables. Only compare axe to axe.