Are online personal trainer certifications actually respected by gyms?

im thinking about getting a personal training certification, mostly to deepen my coaching knowledge rather than just collecting a credential. im more interested in hearing from coaches or experienced lifters about the best online personal trainer certification who actually gone through them.

which online certification gave you the most practical knowledge that translated well to coaching real people? im less concerned about which one carries the most name recognition and more interested in which one genuinely made you a better coach.