Comment by imtringued

A cost advantage?

Over Falcon Heavy? very likely. Over Starship? Probably not.

Capability advantage?

Over Falcon Heavy and Starship? As far as I know, Starship will not have an expendable fairing, nor is a larger payload door a priority and the internal reinforcement cuts into the payload shape, so if you want to launch voluminous payloads, the 7 meter diameter fairing of New Glenn fills that niche.