Actually the Odin has a better powercore than the Sabre. That and armour are the two things that Odin excels in over the Sabre (which still has the speed, size, and gun number advantage). Thor can similarly be compared to the Falcata (larger powercore etc.) though Falcata has a bit more armour while still being smaller, and Thor has 5 guns firing forward. So I guess Hessian power cores aren't that terrible after all.
...
I can foresee the next response being something about dev team bias.