I have eaten several French RCIRs as well as several FSRs. If weight isn't an issue, I do like the RCIRs. The food is rather tastey and there is a lot of variety there. Plus the Esbit stove is a nice touch. I often put an unused one in my pack for emergency uses. I also love the biscuit sweet with a cup of coffee.

As for the FSR, it is light and is meant to be eaten with no real preperation. So, on a rainy day, it is usually easy to just grab one of the sandwiches. It does get "old" if that is all you are eating tho. This type of ration is also specified to not be eaten for any extended period of time.

So, there is really a place for both types, depending on what you want from them. A hot meal with variety, but heavier weight, or a light / convenient meal. I often supplement the FSRs with a Flameless Ration Heater and a hot beverage bag in order to have a quick cup of coffee.