I've had questions about my Vigilence Tanking Build, so I am providing a link to it here.

Remember, with it you are still a tank and should be in Soresu Stance and using Guard
Your Priority is:
Guardian Leap
Force Sweep
Sundering Strike
Overhead Slash
Force Status
Blade Storm
Slice
Strike

You should also try to use Saber Throw and Force Leap as often as you can, but these are positional, so I didn't include them in the list. A good time to use both is right after Guardian Leap

It has some more Focus issues than defense, but Guardian Leaping to a ranged, then using Sabre throw and Force Leap helps a lot

Would you say this is better than Defence? Ie. whats the threat generation and survivability (for solo play) like?

Don't know about solo, but it relies a lot on Guardian Leap for survivability.

In groups, I'm just as easy to heal, and that's with me not leaping constantly, so I don't have my 20% reduction up as much as I should. On threat, I have less snap threat, which can be a problem early in the fight, but I have more DoT, so having to move out of melee range is less of a problem

Also, unremitting means I can't get stunned or knocked back right after jumping in