Cuando estuve/estaba?

Cuando estuve/estaba?
 

Hi, which is correct to use?
Cuando estuve aquí por la primera vez.
or
Cuando estaba aquí por la primera vez.

I think it would be the first one. |Could it be both?

Could someone confirm this?

Gracias. :D

It could be both. It depends on what you're trying to convey.

There are several threads here in the forums where the differences between the two tenses are discussed.