Me sumo vs. Estoy de acuerdo

Me sumo vs. Estoy de acuerdo
 

¿Son igual?

No, no son lo mismo. De hecho son muy diferentes.

"sumarse" significa "to join": "Yo me sumé a la discusión".

"estar de acuerdo" significa "to agree": "Yo estuve de acuerdo con la decisión"

;)

Estoy de acuerdo = I agree

Me sumo ---> = Me uno [most of the time, used is several American countries] = I join (to some group holding some position or opinion) / = to subscribe or endorse (an opinion)

Me sumo --->[sometimes used as] = I concur [with all the nuances that makes it sort of different from 'agree']

Me sumo ---> = Me uno (all other uses: to join a group, etc)

No creo que hay ningun diferentes entre "I agree" y "I concur"

Luna Azul ;)

You concur to some suggestion in order to consent it? You concur on a price because you have come to an understanding in a bargaining process? You disagree on "concur" having a great deal of "meet" or "assent" while "agree" has a great deal of "accede" or "come to terms"?

Sí, es subjuntivo. Frase negativa que expresa duda.
;)

I use "agree" for all of those. I would only use concur if I were writing science fiction or wanting to sound like a robot--e.g. then I would use words like Afirmative and "I concur".

... It's good to know it ...