Ceratosaurus vs Nanuqsaurus

Nanuqsaurus is pretty dead, Ceratosaurus has a good 100 kg on it as well as a length advantage. Also C. nasicornis might just be a juvenile C. dentisulcatus. So I vote for that.

I would lean towards Ceratosaurus as its still larger.

ceratosaurus wins this fairly easily.

carrano el al.(2012)
Two of the new adult specimens have been designated as holotypes of new species, C. dentisulcatus (UMNH VP 5278) and C. magnicornis (MWC 1.1) (Madsen & Welles 2000). However, the purported diagnostic characters of these two species are based almost entirely on proportional differences that are probably attributable to individual and/or ontogenetic variation; many can be specifically attributed to differences in body size. For example, C. magnicornis is supposedly distinguished from C. nasicornis by its ‘more massive’ lac- rimal, dentary and ventral part of the quadratojugal, all of which may simply be the result of allometric scaling. Like- wise, C. dentisulcatus is distinguished by its ‘more massive’ premaxilla, maxilla, dentary, teeth and tibia – all of which might again be due to allometry. Other diagnostic charac- ters relate only to the absolute size of elements, which in larger individuals cannot be interpreted to have systematic meaning. Finally, the genotype specimen of C. nasicornis is an overly fused and pathological individual; some of its features should be interpreted with caution. Accordingly, we
agree with Rauhut (2003) that only one species of Cerato- saurus can be documented in the Morrison Formation.
A femur and tibia from the Late Jurassic of Rodela do Volmita ?o, near Lourinha ?, Portugal have also been referred to Ceratosaurus, along with isolated teeth from other localities (Mateus & Antunes 2000; Antunes & Mateus 2003; Mateus et al. 2006). The tibia apparently more closely resembles that of C. dentisulcatus than C. nasicornis (Mateus & Antunes 2000; Antunes & Mateus 2003; Mateus et al. 2006). How- ever, the supposed similarities are with distorted features of the right tibia of C. dentisulcatus; the left tibia of the same in- dividual is identical to those of other Ceratosaurus ‘species’. Thus we refer to the Portuguese specimen as Ceratosaurus sp. or Ceratosaurus cf. nasicornis.

going by this, ceratosaurus nasicornis is could only be a junior synonym of ceratosaurus dentisculatus, meaning it would possess a massive size advantage.

Ceratosaurus wins.