You're not going to go wrong with either one. I would be more concerned about the quality of service from your local distributor. We buy a lot from both distributors in our area and I have no problem recommending both to clients. The local distributor puts a mark-up on the product and for us they are priced out about the same when looking at Marvin Ultimate DH or Pella Architect Series LX. The Marvin Ultimate DH is (IMO) a slightly better unit in terms of operation. To me the Marvin is a little smoother and more refined, but I would put either in my home. There are other products that Pella makes that I prefer over Marvin. The only comment or concern I would have is about the distributor. One of my distributors offers kick backs to architects and builders to push the customer towards their brand. We have been offered ski trips and fishing trips in the past. If your builder or architect is really pushing one over the other, be very leery. IF you are seeing a significant price difference then you might be paying for someones vacation. Price them both out and request line item pricing and elevation drawings with their bid. Both companies have the ability to provide this with the stroke of a few keys.

It gets very cold in MN. Like I said, I had the Marvin Integrity - which was fiberglass exterior/wood interior and really liked the casement version. The Marvin Infinity is fiberglass exterior and interior. I did not want wood interiors because I don't want to worry about painting/repainting or wood being exposed to or damaged by potential condensation. Both windows have the same argon gas and low E366 glass. I know the Lindsay is a good window, but I did like the look of the Marvin Infinity better, did not care for the look of the corner welds on the Lindsays vinyl. I feel that the increased strength of fiberglass over vinyl is worth the extra $4000. This is not a DIY project. The windows will be installed by a contractor that is an authorized installer of Lindsay and Marvin with 66 years in business.

Infinity is an all fiberglass or ultrex product with an option for a wood like interior. Nice product but expensive for what you get when compared to the Integrity wood ultrex. Both Marvin company products but marketed differently. Infinity is a dealer/distributor installed product while Marvin/Integrity has wider distribution/installation channels. Personally, I think the Marvin line (as opposed to either Infinity or Integrity) is the best and has more to offer.

Hi, E Weiss, It looks like you've got a lot of responses to sift through! I just wanted to chime in and ask if you've considered other window materials? I think wood is beautiful but you're right they are pretty expensive especially when you want to replace all the windows in a house or building and without regular/frequent maintenance they won't last long. Even aluminum or fiberglass cladded aluminum windows eventually need to be replaced because water/moisture can find its way behind the cladding. I think I read that you're in an area that experiences lots of rain or snow? If you would consider something other than wood I would recommend looking for a fiberglass window vendor. A quality fiberglass window can outperform a quality vinyl and will certainly outperform an aluminum window. They'll also last longer than wood windows with much less maintenance. I can't recommend any specific product line for you, we're in Texas and used to sell Milgard's Ultra Series but Milgard was acquired by another company and they've left the state. Milgard may have also stopped selling the fiberglass Ultra series. It looks like fiberglass-windows.com suggests Marvin, Milgard, Fibergrame, and Pella as fiberglass window manufacturers. Good luck with your replacement project! - Ariana