I would rule out the Infinity due to higher price and nail fins. I would look at these products first hand as the all have a different look and you are going for a specific style. Marvin has a Modern line that sounds like what you are looking for. I’d consider your exterior trim as both factory trim options that look great. Marvin Essentials and elevate are options also. Both have there warranties readily available online. I have no coastal experience. I think if you looked at them the answer will become more clear. Both companies are solid but I think in general the Marvin is a little nicer but they do very between there lines.

Marvin, if you check their site, has replaced the Infinity/Integrity names with Elevate/Essential. Infinity was only available with installation by dealers. While you're on the Marvin site look at their newest line Modern. These use a denser fiberglass frame construction than Elevate/Essential products to allow even thinner lines. I would seek bids from several sources for your project.

Warranty

NON-GLASS COMPONENTS Hardware and other non-glass components are warranted to be free from manufacturing defects for ten (10) years. Stainless steel hardware and hardware with PVD finishes installed in coastal environments are warranted to be free from manufacturing defects that result in abnormal deterioration of the finish for a period of ten (10) years. Other hardware finishes are not warranted in coastal environments. Electric operators and other motorized accessories are provided with the same warranties, limitations, and exclusions Marvin receives from its supplier; contact Marvin for further details.

Andersen E Series Warranty

We went and met with the Marvin dealers today and came away impressed. They are able to do the Infinity (fiberglass/fiberglass) and the Ultimate (aluminum/wood) product in our sizes ( we have some big windows) but not the Elevate (fiberglass/wood).The Ultimate is 15% higher. Since we are planning black/black windows, my husband really likes the Infinity product to have the fiberglass exterior. Any thoughts? We are talking to Andersen about their E and A series and Kolbe about their Vistaluxe as well.

Please stay away from Anderson especially E-series they have quality and production issues! I’m on the water in NJ the hardware failed immediately the dealer said it’s under warranty now Anderson says it’s living finish! They just changed their warranty after the fact! Also casements are failing Anderson says they should not be opened in 15-20 mph winds and they only rate their windows when they are closed. I can go on and on. Stay away I spent 180,000 dollars to be back and forth with them for 2 years.

Yes big home windows and doors, also origin door in house ...

What did the warranty say on the product at the time you ordered the windows? That would be the binding documentation. And obviously what you would have reviewed and somewhat based your decision on.