I live in Paris and was recently in the US, and I strongly disagree - US cities have much less greenery, be it trees on the streets, mini parks or big parks. Most French cities have parks all over the place, and in general lots of squares with trees, random trees on the streets, etc.
I live in the US and was recently and Paris and I strongly much more disagree. Paris was claustrophobic it was such an urban hellscape. There's a reason Haussmann wanted to raze it to the ground.
He did raze much of it to the ground, and created a number of parks and two forests in the process, as well as trees on pretty much any new street. Even the very old (medieval) parts like the Latin Quarter and Marais have mini parks all around.
