Running the numbers through Coriolis the up time difference is marginal and the lower rebuild times more than make up for the differences.
Using Stock Eagle as a baseline opponent with my current engineered shield booster and PD setup:-
L4 Reinforced 6C Bi-Weave (311 MJ): Hold = 0:55, Recover = 0:39, Recharge = 0:51
8C Bi-Weave (810 MJ): Hold = 2:17, Recover = 1:05, Recharge = 1:09
8C Normal (877 MJ): Hold = 2:29, Recover = 1:10, Recharge = 3:02
8A Normal (1011 MJ): Hold = 2:51, Recover = 1:19, Recharge = 3:30
8A Prismatic (1212 MJ): Hold = 3:26, Recover = 2:08, Recharge = 7:12
The key points to note are:-
- the Recharge time difference with the Bi-Weave is significantly lower (2 minutes faster than normal shields)
- the Recovery Time is slightly better (5-15s faster than normal shields) but near enough the same
- the Hold Time is still pretty decent (over 2 minutes and only 15-45s less than 8A Normal)
If planning for a stand up fight, Prismatics may be the best option on the face of things but that recharge time is a killer. The 8C Bi-Weave may still be the better option in reality.