I put in 26 replacement windows about 7 years ago. I found that the paces that advertise heavy are pretty big rip offs.
I shopped hard and probably compared 20 or so different brands/companies.
I finally bought them from a small local shop. I liked the guy, he was honest, the windows were made locally in New Britiain, Ct (15 miles away), had all the same construction features that I liked, and he demostrated the installation of one window.
Wife and I got good at replacing them... we had it down to about 1 hour per window after we did a couple of them and had all the tools out. The woindows we replaced were the old double sash style (circa 1910) with the iron weights.
So shop hard, compare features and don't necessarily buy the big name brand.