When you want to reinforce a command, such as fermati (stop), stai zitto (shut up), vai via (get out), etc., one way to do it is to add che è meglio afterward. It's a way of saying you mean it, and that if the person doesn't obey, there will be consequences. Literally, it's "which is better" and can be translated with "it's for the best," but it can also imply "you'll be better off if you do as I say," or "I mean it," or "or else [there will be consequences you won't like]," or even "You better [do as I say]."

Lojacano is telling a suspect to stop.

Nico', fermati che è meglio, eh. -Mi so' [sono] fermato.

Nico', stop, as you're better off, huh. -I have stopped.

Captions 16-17, I Bastardi di Pizzofalcone S1EP3 Vicini - Part 21

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Michele is not very welcome at the meeting at the Nest and Riccardo encourages him to leave. 

Scusate, ma sono molto scosso. -Ecco, bravo esci. Esci, che è meglio.

Excuse me, but I am very shaken. -There, good, leave. Leave, as it's for the best.

Captions 13-15, Liberi tutti EP1 Ma bevete anche l'aqua piovana? - Part 6

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Paolo's parents don't want him to say another word. He is already in big trouble. He tries to talk, his mother shuts him up and his father puts the stinger on the end. 

Mi scusi, dottore. -Ma per favore, guarda, Paolo, per favore, stai zitto. -Che è meglio.

Forgive me, sir. -Oh please, look, Paolo, please, shut up. -Which is better [you're better off].

Captions 7-9, Com'è umano lui Film - Part 7

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Che è meglio is usually something you say at the end for effect, often accompanied with an appropriate facial expression and gesture. 

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