PvP you'd want a cloak and high cap shield setup for the spike mitigation and such for, PvE you want faster regen rates and lower times since you are popping in and out of cover against npc enemies that deal sustained damage.
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I've been using a 9 second delay shield with a big buffer. I've found it very effective to use a my shotgun in the first slot and the BMG in the second, for the most part only using the BMG to restore my shield. I'm using the BMG with the longer range, so it takes care of my ranged needs, as well. Usually, though, I'm up in close with shotgun and melee until I take a big hit, then I power my shields back up, manually.
There is a perk by the Decoy Ego Power that benefits you only when your shield is recharging. This one would synergize with the slow recharging shields, but I haven't tried it, yet.
I think it is too soon to say that this or that gear is useless. Really, cookie cutter approaches will emerge, but they rarely represent the only way to get things done.
Wait, there are shields with lower then 6s recharge? I haven't seen one yet, seems to be my usual luck with loot.