They'll try to push whatever brand they carry, whatever has the highest mark up or whatever has been sitting in their warehouse the longest

I saved hundreds buying mine online. The plumbing, electrical and even the gas were a joke to hook up. The gas was a bit of a PITA because it took a few trips to Home Depot to have the correct lengths made.

Even if I had to pay it's still cheaper to buy it online and hire your own plumber to hook it up.