Brightline is a totally different experience. I rode Brightline the first month they were in operation. They will, if they continue, show everyone what rail travel can be in the USA and how relevant it is. Their train stations resemble an airline terminal designed by IKEA. Their trains have modern touches like ramps that bridge the gap between the train and the platform (no more "mind the gap"). The interior of the cars are fine.. nothing overly special and actually, like Amtrak, a bit sterile (the best passenger train equipment in the USA, imho, is the Carolina owned equipment.).
My problem is.. you're comparing an in-station lounge with an on-board meal. Amtrak does pretty good with at-seat meals on the Acela trains, complete with silver ware, china, etc. And all without a chef! So it's very possible for Amtrak to provide a better product.