in terms of both ... and ...; whether it be ... or ...
Pattern: AといいBといい. Used to list two aspects, both of which support the speaker's evaluation. Often implies 'not only A but also B' or 'both A and B are ...'.
This hotel, in terms of both service and location, leaves nothing to be desired.
He is an ideal leader, whether you consider his personality or his ability.
Derived from the quotative particle と and the verb 言う (to say), literally 'saying ... and saying ...'. The expression grammaticalized into a fixed pattern for listing evaluative aspects.