as long as the evap coil is a Lennox(not a third party) and you get the 10 yr warranty parts and compressor, then go with the Lennox XC13. I would not pay $1K additional for the Trane XR13.

IMO

Additional info. The furnace is fine. It's a single stage 80,000 btu Trane.
So no issues mixing and matching brands?
Is the XR worth $700 more than the XB?
Based on past data, which is more likely to fail quicker?
Based on my reading, I am a bit shy on the Lennox due to reviews...but should I be?

Yes, its' a Lennox coil
Yes, the Lennox has a 10 year compressor warranty. 5 years on parts but it becomes 10 after you register the unit with Lennox. They will extend the warranty to 12 years parts AND labor for another $550. I might ask they throw that in for free. Probably worth it.

Ok, thanks. So I shouldn't be concerned with the Lennox unit.