Last week I heard Everfi founder, Tom Davidson, speak. My favorite advice of his—stab to the heart; praise to the back.
Stab to the heart. When you have negative feedback, tell someone to their face. Yes, the stab initially stings, but it will probably make them (and your relationship) better.
Praise to the back. When you have positive feedback, tell everyone they know. Building others up changes the whole culture of your team and boosts up the person far more than a simple compliment to them. (As an added bonus, people actually associate the traits you compliment other people on with you.)
So today, do both.