vs
QUICK ANSWER
"Todo bien" is a phrase which is often translated as "all good", and "vos" is a pronoun which is often translated as "you". Learn more about the difference between "todo bien" and "vos" below.
todo bien( 
toh
-
doh
byehn
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. all good 
Están muy callados, niños, ¿va todo bien? - Todo bien, mamá.You're too quiet, kids. Is everything okay? - All good, mom.
b. everything okay 
¿Todo bien, mi amor? Te ves agobiado. Is everything okay, dear? You look overwhelmed. 
vos(
bohs
)A pronoun is a word that stands in for a noun (e.g., she).
1. (informal) (second person singular) (Central America) (South America)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
Regionalism used in Central America: Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, and Panama
Regionalism used in South America: Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, and Venezuela
2. (old-fashioned) (personal)
A word or phrase that is seldom used in contemporary language and is recognized as being from another decade, (e.g., cat, groovy).
a. thou  (old-fashioned) (subject)
A word or phrase that is seldom used in contemporary language and is recognized as being from another decade, (e.g., cat, groovy).
Mi señor, vos sois mi amo y os obedeceré.Milord, thou art my master and I shall obey.
b. thee  (old-fashioned) (object)
A word or phrase that is seldom used in contemporary language and is recognized as being from another decade, (e.g., cat, groovy).
Me arrodillo ante vos, Rey Pedro.I bow before thee, King Peter.