Been using that myself it's got some good scripts lacking in some areas but has improved A LOT in last 2 months. Decently active forums as well with nice people.
The mirror, as i am aware , is a method that allows you to bot on your browser.Somehow it ports the script to the browser , so it looks like you are playing using it.As i am concerned it makes client undetectable.However tribot/topbot are undetectable without the mirror.
For OP, i would say tribot, because it has more quality scripts and writers, thus Trilez is doing really great job with human like behaviour, it's kinda similar what RID is trying to accomplish