Preterite Vs Imperfect

[fglorca]

El ambiente en el concierto era fantástico.
El ambiente en el concierto fue fantástico.

I understand both tenses are correct here, but which is more commonly used?
Would it be the Imperfect because we are 'describing' something in the past?

Many thanks in advance.

[AngelicaDeAlquezar]

The use depends on what the speaker has in mind: either the time during the concert or the experience past.