Get the Lynx. It is a bargain at $4,700 (see discussion of Kalamazoo below). Lynx has a cast brass burners, just like commercial restaurant grills which are used every day 12 hours a day for years. The only other consumer grill that has cast brass burners is Kalamazoo which starts at $10,000. Fire Magic has cast stainless burners which are also good but Fire Magic costs the same as Lynx so why not just get the Lynx and the restaurant grade build?
Sedona by Lynx, Wolf, DCS, and all the other brands have sheet metal tube burners. These WILL corrode over time, especially if you use a lot of marinades (bulgogi, etc) or the stuff you cook has a lot of drippings. For a built in, you want something that will never corrode. A couple thousand bucks amortized over ten years is nothing. Corroded burners are expensive to replace assuming the particular part you need is still available. I've used a Lynx for many years and have great results. Lynx has a lifetime warranty.
Sedona by Lynx, Wolf, DCS, and all the other brands have sheet metal tube burners. These WILL corrode over time, especially if you use a lot of marinades (bulgogi, etc) or the stuff you cook has a lot of drippings. For a built in, you want something that will never corrode. A couple thousand bucks amortized over ten years is nothing. Corroded burners are expensive to replace assuming the particular part you need is still available. I've used a Lynx for many years and have great results. Lynx has a lifetime warranty.