Adding to the points raised above your play style will also impact which feat to get. If you plan to play GOD style you may not need resilient con at all.

If you play in such a way that it maybe levels before taking any damage Lucky is by far the better feat to take.

I have a wizard I started with 13 con and planned to take resilient con ASAP but by level 8 I only had to make 3 concentration checks in total. I decided to max int and grab lucky instead.

If you plan to Gish it up then you’ll need resilient con for sure.