Question Regarding Resilient and War Caster

Running a Spore Druid mainly as a caster. I know melee + Shillelagh is probably more optimized, but I like the idea of caster more. First playthrough and I’m trying to go as blind as possible on builds/min maxing because I find theory crafting more enjoyable, but I have a question on interactions.

From what I can tell, one is proficiency and one is advantage. Would having both on a level 12 Spore Druid be overkill?

I just got the Spore Druid Armor piece and am realizing how crazy Haste Spores can be in fights. Most of my spells require concentration so I think it’s quite important at to maintain that, but was contemplating adding alert over one of the two so I can move first in battle with Haste Spores, enabling the rest of my party to get two actions turn one which is a massive advantage.

I also have the flawed Helldusk Helm for +1 to Constitution Save and +2 Spell Save.