T1 Mining Crystals vs T2 Mining Crystals

Hi all. I am trying to determine if it is worth using T2 crystals over t1. Taking simple crystals as an example the A’s seem to have a small yield modifier, but are used quicker with an element of residue

and the B’s, pretty much the same with a small cycle time difference too.

I cannot see an overall massive advantage of using T2 over T1