In Grendel, what is Grendel's judgment on himself and the ram when he compares himself to the animal?

On the one hand, Grendel points out the ways in which he
is definitely dissimilar from the ram. His first point of difference is the way thet he
says his brains are definitely not, "squeezed shut, like the ram's, by the roots of
horns." Grendel is disgusted by the lack of "dignity" possessed by the ram, in
particular focusing on the ram's sexual drive and his "mindless ache to mount whatever
happens near." However, the next paragraph focuses on the points of similarity between
the two figures. Notice how Grendel describes himself as little better than an
animal:

Not,
of course, that I fool myself with thoughts that I'm more noble. Pointless, ridiculous
monster crouched in the shadows, stinking of dead men, murdered children, martyred
cows.

He clearly depicts
himself in this sense as being little better than the ram which he compares himself so
disfavourably with. On the one hand, therefore, Grendel has the intellilgence and
capacity to reason that separates him from the ram. On the other hand, his appearance
and deeds means that he has to hide away and become a "pointless, ridiculous
monster."