Probably Shadow Stealth tbh. The 2024 Player's Handbook didn't change anything about it from the 2014. It adds a +1 to either my intelligence, wisdom, or charisma which is always great. But more importantly it lets me turn invisible once per day and I get to have a level 1 illusion or necromancy spell available and always prepared. Definitely a 10/10 feat and highly recommended for any full or half caster character build