Only by virtue of the contract.
As a player Gudbranson is worse. I love him as a person and leader for this team and I'm biased towards wanting to keep him as a #7/8. But Gudbranson can't make an on the tape pass the majority of the time. He does better in shovel it up the wall type systems. Many failed breakouts per game directly attributable to him. Severson does the right thing most of the time and just drifts off mentally a couple times per game and takes a lazy penalty or gives the puck away.
I have a strong distaste for the lackadaisical type of play that Severson brings to the defense. But when I think about next year and where we are going to find better defensemen I suddenly become appreciative. He's certainly getting better results this year than we can expect from an average third pair D. We're still above even in goals results with him - 57 to 55. A more average third pair result would be underwater, perhaps 40 GF and 50 GA. I just checked
D-men 128-186 in 5v5 TOI per game, and they are usually underwater on goals results. Lower event, on average giving up fewer goals than Severson does, but their teams score much much less.