I haven't heard of that issue in Steemvoter before. But yes, SteemAuto allows users to autovote for anyone. You can also follow curation trails, schedule posts, autovote within your comment section, and automatically claim rewards.
Another difference is that Steemvoter charges users - either pay a monthly fee or allow Steemvoter to upvote one of their own posts with your account every day. SteemAuto does not self-vote or charge fees.