Not a question in my mind, Marvin/Integrity is miles ahead of Jeldwen. The fact that the price is almost identical is a win/win. The fact that your builder thinks Jeldwen is the better choice than Marvin/Integrity should through up a major red flag in my opinion as Jeldwen is mediocre at best and I don't think anyone with any window knowledge would even think to argue that fact!

+1

This is the sports equivalent to a layup.

I am with Millworkman on this one.

Thanks for your help! That's what I thought based on my research. I can't make sense of my GC's preference for a lesser brand. Are the Integrity windows tricky to install properly? Do some brands offer benefits to GC's who use them? I don't mean kickbacks per se (although that would make sense), but maybe better customer service if something goes wrong?

The window selection world isn't that interesting with kickbacks and other spiffs.

Nothing more or less difficult about hanging that window.

That's a relief. Beyond that I'll just let it be a mystery :-)
Thanks everyone!