Deltadromeus would probably have a larger skull - we literally do not know where it belongs, and it might as well be a tyrannosauroid depending on where Gualicho belongs. I’d assume Gualicho is a tyrannosauroid since Deltadromeus has occasionally been synonymized with Bahariasaurus and Bahariasaurus may be the largest megaraptoran (Megaraptora probably belongs in Tyrannosauroidea).
That’s the most likely classification for sure but then within Coelurosauria it’s most likely to be a megaraptoran and Megaraptora is part of Tyrannosauroidea