Anyone pushing a brand that is better or has any claims that ones is better stay away from.
Look for the folks that can make any machine work
they all pass the same standards and some better than others....I think you'll find the one everyone seems to dislike the most in here as the one having the best warranty and one of the better performances from ARI.
AHRI Directory Terms & Conditions
Find model numbers and compare performance of the ones you were quoted on.
make sure the companies include labor warranties along with service agreement where if anything goes wrong it will be covered without any out of pocket expenses....make sure you say that specifically.
The best HVAC tech can install the so called "worst" equipment and make it perform well......the worst hack can install the so called "best" equipment and make it fail.
If you truly don't want to worry about if the systems is designed correctly and will perform correctly you need to find a contractor that goes by ACCA standards and does not jip you on a professional install....after all... all of the HVAC co's I know charge over $100/hr.....why not get one that actually knows the physics of it and follows the standards.
Manual J Residential Load Calculation (8th Edition - Full)
Manual D - Residential Duct Systems
Manual S - Residential Equipment Selection
You might pay more for you to know it's done correctly. However you have no idea what it will cost you when it's done incorrectly.