I do love to buck a trend, but that's not going to happen here. Portrait of a Mutant is probably the single best Stront story ever; but it's by some way the better story here specifically.
Final Solution is not the unmitigated disaster some would make it out to be, but boy does it have a lot of problems - foremost among those is sidelining the strip's lead for wannabe-star Feral (I know Grant's denied this was the intention, but when you read FS it's glaringly obvious - Feral gets the first and only splash pages in the strip's history, and they're very much 'How cool is this guy?!', not to mention the only non-Johnny first-person narration). I don't like the Lyrans, I don't like how the story treated Billy Glum, I don't like that it was a nondescript monster that finally killed Johnny, I don't like how rushed (and yet simultaneously long-winded) it feels. And I don't much like Feral.