Spiderverse Miles is better because it gets rid of the retarded mary sue/jesus bullshit that Bendis used to slather the character in.
In the comics Miles never met Peter Parker but still shared a special bond with him. Peter dies, and then Miles swooped in and took all his friends and family for his own with them just falling for him immediately, including Aunt May, and then proceeds to go through pretty much the exact same fucking shit that Peter did but instead of Uncle Ben it's "what would Peter do, this guy who I never actually met but I'm taking all his shit for myself?"
It was retarded and gay, at least when it came time to kill the Ultimate universe and Bendis played favorites to have Miles transferred over to 616 he at least started to become his own guy with his own circle and shit, but then he became a shittier character because Bendis insists that Miles still do exactly the fucking same shit as before so he even though he was removed from Peter he didn't get to move on like Peter has done long ago.
And for that last paragraph of questions: yes, no, no, no, and he is now but used to only be so in Ultimate.