I had the same exact choice. I picked Trane's XL16i 3-ton HP with XV90 80,000 BTU furnace dual fuel system over Carrier's compable system. This was partly out of biasness and narrow-mindedness that admittingly isn't the safest way to choose equipment. I had an _ancient_ GE Weathertron (late 1960's) package system to replace. After doing research a couple years back, I learned that Trane bought the Weathertron line from GE. Getting 36+ years of service out of the Weathertron leaned me towards sticking with whoever inherited the Weathertron line. I looked at the Carrier and Lennox lines, but kept coming back to Trane. No real reason except I had Trane on my mind and saw lots of folks on here agreed they were good. By the same token, I saw a few (very few mind you) posts that didn't like Carrier. I took those with a grain of salt because I also saw most posters on here claim that the choice between Trane, Carrier, or Lennox was not nearly as important as getting a great contractor. That being said, I concentrated on finding a darn good contractor and decided not to try to impart my biasness of brand on the contractors. As it turns out, the contractor I liked the best and felt most comfortable with, sold mostly Trane units.
The equipment is being installed next week. I'll let you know, if you're interested, how everything works out.