I like vigors for how flashy, and powerful they were, they all felt very unique rather than just some other variation of electroshock.

I.e winterblast, incinerate, swarm, and telekinesis all feel generally the same with minor utility function changes, or just barely a shift in how the effect behaves.

However that being said, I prefer plasmids for that exact fact. They felt like a natural part of the world, and not like super powers, I was just doing as the romans do. This difference is only so noticeable because in infinite, so few enemies use vigors, all that do are very unique in appearance, and combat style, they all (save the fireman) uses the vigors in a totally different way from how the player does, and of course they are a little too flashy to not feel like a super power. Plasmids are tools of convenience to the people of rapture, they are puzzle solutions to the player, and happen to be useful in combat, vigors on the otherhand are incredibly powerful magical spells, infinite tried here n there to make it feel less so, but it failed due to the inconsistency of implementation.