I am a firm believer in the benefits of both practices but have not been able to stick with either one consistently.
I try to get two sets of yoga inspired stretching in each day, morning and evening. And, I definitely notice it when I slack off of this. But, I have not been able to stick with the associated breathing exercises, meditations, etc. contained in a real yoga practice.
For years, I have tried to meditate for a few minutes each evening. But, for some reason, I don't keep up the practice. It does seem to improve my overall quality of life (stress level, general happiness/satisfaction, etc.) a bit when I am doing it regularly.
This may all be placebo effect; but, I am fine with that: Neither seem to have much downside risk; so, I am perfectly happy harnessing the placebo effect to my benefit.