I’m no privacy savant, but I like Firefox better. I think it has the better “modern” interface. It is less buggy on my laptop, has better scrolling to my eye.
From a philosophical perspective I think the web should support more than one rendering engine.
I disable smooth scrolling so my eyes don't have to follow and wait for it to be done scrolling. The scroll height is ingrained so now, on new machines, when it's on it annoys me to no end.