Viltrumits (Invincible) vs Kryptonians (DC) vs Saiyins (DBZ)#
344K
While I haven't seen or read Invincible (the Omnibus is in the mail), I can weigh in on Kryptonians v Saiyans.
Although initially it seems like Saiyans have a higher general base, DBS Broly disproved this notion showing that good quantity of the race aren't anything special, power wise. Even then, the warrior class are generally in the mid/high tier of the Frieza force, which in DB is unexceptional. Goku, Vegeta, and Broly are true exceptions/outliers.
Kryptonians on the other hand need just a little sunshine to become big threats. And then all the other powers they amass over time is crazy.
So, overall, I'd say Kryptonians are superior to Saiyans in most cases.
Although initially it seems like Saiyans have a higher general base, DBS Broly disproved this notion showing that good quantity of the race aren't anything special, power wise. Even then, the warrior class are generally in the mid/high tier of the Frieza force, which in DB is unexceptional. Goku, Vegeta, and Broly are true exceptions/outliers.
Kryptonians on the other hand need just a little sunshine to become big threats. And then all the other powers they amass over time is crazy.
So, overall, I'd say Kryptonians are superior to Saiyans in most cases.