LoH or LS%?

I turned on the option that shows healing received, and I noticed there is a steady 'ticking' of the hp regen, and everything that comes in faster than the 0.5 second standard rate kinda gets 'queued' so I was wondering if it makes LoH attribute much better than life stealing %?

Or is it going through the same process? (meaning hp gain isn't instant).

Or is life steal buggy a bit, because I had a bit over 7% life steal and whenever i critted between 40-50k that should have meant 2500-3500hp coming in but it didn't seem to be that high.

Btw I'm a barb, if that can alter the answer about whether choosing LoH or Life steal%