Metriacanthosaurus vs Becklespinax

Metricanthosaurus parkeri is a species of sinraptorid (or metricanthosaurid, both are interchangeable names for the family) theropod from the middle Jurassic of England. Not much is known about it and it's remains are very scrappy, but it has a ~800 mm femur.

Becklespinax altispinax is a species of Allosauroid (most likely a type of carcharodontosaurid) from the early Cretaceous of England, and is even worse off. It's only known from 3 vertebrae!!! Nevertheless, Gregory Paul estimated it had a total length of 26ft when alive, and the vertebrae that are known from it seem to suggest a small hump was present on its back as the neural spines are really tall. Some scientists have even suggested that it might be a close relative of Concavenator corcovatus because they share this similar feature (an idea which has been supported by a few studies), though despite some claims, they don't seem to be synonymous as Becklespinax's hump consists of three vertebrae if not more, while Concavenator's consists of only two. There was also a poster session at SVP also debunking their synonymy (which I sadly didn't get to see).

All in all I say it's impossible to determine which one of these two would win. They both seem to be in the same size range, and they're both only known from extremely fragmentary and scrappy fossil material. It's a complete toss up with what we know.

Becklespinax and Metriacanthosaurus. Its been a while since I've heard Metriacanthosaurus. Here, in my opinion, this is 50/50. But I may be leaning towards Metricanthosaurus a bit.

I say 50/50 to.