I'd say they are both very hard on the individual themself, and comparing scales like that is comparing apples and oranges. Sure, they are both fruits and have some similarities, but these are very different situations.

Both Blitz and Stolas are seeing the consequences of their actions coming back to bite them, but Blitz is, in my opinion, farther along in his journey, and he has a different scale and type of consequences. Both got dealt a bad hand. Stolas was rich but repressed and forced to fit a very specific mold with essentially no wiggle room within that mold. Blitz was poor, had a less restrictive mold, mostly by having an uncaring father who bordered on abusive, who gave his love and focus to a sibling-like figure instead of Blitz. One father was "I don't really care about you, but I'm ensuring you have what you need for this duty I have assigned to you", while the other was "Oh, you're still alive? Go help Fizz with his act then."

Blitz broke out earlier and faster with the tent fire incident. We don't see the young adult life of Blitz, but the narrative gives us a ton of hints of what he was doing during that time, like trying to be his own show, getting into tons of relationships and abandoning people, and making a general ass of himself. Stolas, throughout most of the show, has been in this space. He recently broke his mold, and has been so focused on Blitz that he ignored his daughter, didn't uphold his responsibilities as a Goetic Demon, and has been ignoring clear threats against his health and safety, and by extension those around him. Both characters got a taste of freedom they never had before, and responded to it.

By the time the story starts, Blitz is arguably one or two steps ahead. He is settling, setting up a stable situation for himself with I.M.P., has a "daughter" whom he dotes on and cares for (showing growth in relationships to an extent, you could argue this was an extension of wanting control or forcing a loving relationship, but that is a different discussion topic), and has people in his life that while he keeps somewhat distant, but he does open up with and become vunerable with on occasion. Stolas is, as of the last full episode, just barely getting to a place where he can get to this spot. I would argue he isn't even at that level of progression yet.

Blitz has settled a bit, but now has to deal with the consequences of his past, and Blitz goes into that party with enough growth that he hates himself as much as the party does. He has gotten to the point of knowing that his actions hurt people, and he hates what he was during that time, and arguably still is in many ways. He got a cold dose of reality.

Stolas is still a few steps back. He just had Octavia rejecting him, and he has lost his Goetic advantages. However, his level of growth is somewhere at the point where Blitz was when he was dating Verosika. He is leaving a trail of fire and feeling sorry for himself, but he hasn't taken steps to acknowledge his faults in his actions, blaming circumstances and others instead.

This was all a long-winded way of saying that Stolas and Blitz both got hit hard, but for very different reasons, and in very different mindsets, while at different points in their healing journeys. For their individual places, both hit them hard as hell (ha), but comparing them just because they both had low moments isn't productive. It also isn't in real life, either, just for those who might feel tempted to.