It's nearly impossible to pick one, I find beauty in each kind.
I would go with Platanus. They exist near rivers and get really big. I like everything about them.
Then all the wild versions of cherry trees, if not every single stone fruit tree. Most wild versions of them, exist across multiple human lifespans (platanus too), so beside their amazing flowering season, I like the idea that some of them have been standing there for centuries, marking memories of many human generations with their beautiful presence.