I think it really depends on the Dog,
Bea can be funny with her food, although she is absolutely fine if I cook for her especially turkey and rice or anything from the Lilly's Kitchen Book
I have two flavours of Forthglade and McAdams (Chicken) kibble, I rotate between these every so often and Bea would usually have a couple of days a month where I cook for her and then we are back on the a Kibble.
Bea developed a issue with food after an illness and this is what works for her.
Have you thought of getting a sample of the other flavours to see if Marley likes it ?