What are the best photon arts to use as a gunner with the new crafted PA's available ? thanks for any advice

Mostly all have their usage, just some more than others.

You can read https://forum.pso2.com/topic/1700/gunner-tmg-photon-art-usage-guide & https://docs.google.com/document/d/1kfjkUQzY3QRmILocETvCqsyBiUtk_PM9n6hw6hB2y4k for more explanations.