Well yeah, Kaine is part of the 616 while Miguel is from an alternate universe/timeline, so that makes sense. Though I do think Pete likes/trusts Miguel more (Kaine's relationship with Peter has been very strained since the beginning, except for that small part of time between Spider-Islan and Superior).
I think Miguel's better only in the sense that Miguel was conceived as a full-fledged adult from the beginning of his existence, therefore Marvel has no qualms about letting him be an adult as opposed to some caricature of what they think a "young person" is or should be. Also, having Peter David as the chief if not sole architect of his development as a character means Miguel has a lot more going for him in terms of narrative consistency than Peter does, since more than 50 years of continuous publishing means a variety of different voices trying to say different things about or for Peter's character and some of them have frankly missed the mark.
The spider is always on the hunt.
what are Miguel's powers currently? Anything new, or lost?
No new powers, and I think he kept all his powers though IIRC we haven't seen him use the poison bite for a while. The armor Peter built for him is really tricked out though, it can stop a Howitzer shell, go invisible, fly, has a bunch of sensors and internet and stuff, has explosive weaponry, and some other stuff I forgot.
No Miguel, or any non-X-men for that matter, in today's X-Men Blue issue. Still a fun little romp through a slightly altered version of 2099 though.
I would say he ain't better than 80/90's adult Peter, but at least as good. But he's definitely better than manchild Peter.
On a subjective note, I prefer Miguel over Peter. His initial run was wo interesting, the family drama was well made, the characters interactions were great, Miguel himself was such an interesting character. This new run wasn't as good, but it was still a blessing to have PAD on spidey 2099. He's sadly, the only person who doesn't write Miguel as peter parker lite (see exiles for instance).