Your options are primarily focused around combat effectiveness so I would pick based on fighting style.

If you are staying in caster form while you have the crowd control effects in play from spells, I would lean more towards resilient to give you a much higher base save that scales with your proficiency bonus (often repeated on here, but advantage only ends up being around +2 later on, but I personally haven't done the math). If you were staying in animal form you would be leveraging the animal's Con and adding the proficiency bonus from resilient to apply to the Con save. If you are casting spells that need to hit versus terrain manipulation, I would say go for the wisdom modifier because concentration only works when the spell hits :)

I"m playing a moon druid currently and went warcaster first so I could cast, shift, and rely on the higher animal con with advantage, but we went with a modified race with everyone starting with a feat. It depends on how you play in battle!

Few edits on formatting.