I had an HVAC service guy tell me once to watch out.. A brand in particular (starting with "L")
have a lot of proprietary parts so replacement for any bad parts such as a pcb board, relay, etc had to be their part and their part only.
Now, in all fairness, expensive proprietary replacement parts may be the norm with many brands, but service cost and availability is a criteria I would at least investigate. The above mentioned brand I just threw under the bus though
happens to be both of my condenser and air handler units and they are both going strong at around 18 years now, so that's also another large consideration.
All this is just one guys opinion and limited info but thought I'd offer.
I also have a Quality Engineer friend who's worked for Carrier and back with them now infact and he's quite proud of their commitment in design and manufacturing quality levels.
Hope I helped more than I just threw out opinions and hearsay with no real facts or data. hehe