Best Thaumaturge Shield

[Catapult]

To clarify, it does need to be raised to gain the benefits of additional defence/damage reduction, but it does not need to be raised to get your bonus points in piety, dex etc.

[SeraviEdalborez]

Thalassian Targe (or a m.acc shield) if you need it for hitting another tier of PIE (or need more m.acc).
Shield of the Savage (or any 85block shield) for everything else.
If you only use shield with Aegis/Deflection, the only stat that really matters is Blocking.
If you don't hold it up at all, just use it for whatever bonuses it gives.

[Actus]

Shield of Savage is horribad... Shield skills only stay active for 18 seconds. That's even with Self Pres. Stick w/ Bladed Lantern. Negligably lower block rate, but higher yield rate means that the skills stay up for 24 seconds instead of 18.

Healing = Thal. Targe
Nuking = One of the wooden square shields
Solo/Tanking = Bladed Lantern Shield