Warner's been pretty candid in the past that he personally thinks of himself more as a Cardinal than a Ram. Sad to say it, but that's the truth. And it's not that weird from his perspective. The Rams had a HOF QB. They let him go when he was injured because some other guy (who will never be in the HOF) had a hot hand. And there was some personal relationships in the mix that went bad, too.
So, for Warner, I think he has very fond memories of being a Ram, but the way things ended was bitter.
Now, everyone remembers him
best as a Ram, and he's got his one Super Bowl championship as a Ram, so he's always loved his fans who are also Rams fans. But in his heart of hearts... he considers himself a Cardinal.