Quote Originally Posted by stingnewell View Post
One of the things I like about Ultron slightly more than Kang is his personal connection with the members with Hank, Wasp, Scarlet Witch, Vision and Simon. He has a warped concept of family while still obsessed with his goal on human extinction. He incites on a personal level of terror on its long standing core members. Which too me makes him all the more sadistic.
The familial connection is oddly why I think Ultron comes second to Kang. Ultron is a villain of the characters you listed and an Avengers team lacking in those characters Ultron lacks any real connection with. Kang on the other hand wants to conquer our time and sees the Avengers as the challenge that needs to be conquered.

So the way I see it is Ultron is the greatest villain of certain Avengers while Kang is the greatest villain of the Avengers as a team.
Loki gets points for being the first.