For me it kinda depends on what mood I'm in, or what I'm paying attention to at that moment. It think all of their albums have very strong points and I think they all have some weaker points.
HHOP: I actually rarely listen to it. Listened to it this morning in full and it just made me smile. Some intstrumental bits are just soo fun and goofy and you have Deryck being an undeveloped singer which adds a lot of how you don't take it seriously and enjoy it for what it is. Doesn't really have any standout song for me.
AKNF: I don't listen to it that much. Think it's vocally a lot better than HHOP and also a bit more cohesive. It's musically better but a bit less fun I think. Fat Lip and In too Deep are the bomb, Handle This suprises me every time in that they had a pretty good slower song back then already and Pain for Pleasure is awesome. Also I reference Introduction to Destruction way too many much.
DTLI: I listen a fair bit to the songs, but almost never the album. I don't like the production of it, and I think it's the album with the least variety in the songs. Still, the singles, No Brains, Mr. Amsterdam and Hooch are great. + I always forget how awesome World War VII and Reign In Pain are
Chuck: Love Chuck. Bigger darker and more varied than DTLI. Production is also a lot better. Only track I really don't like is Open Your Eyes, though I often end up skipping from Bitter end to I'm not the One. 88 is one of my absolute favourites, though sometimes it feels to me that it's not completely finished and it would've come out better if it had been written in the SBM era. Shame they never play it live in its entirety. Bonus tracks are ok. Always do a few repeats of the Subject to change intro, and Noots is the most upbeat sounding song on the album.
Underclass Hero: Think UH is one the more mediocre albums, even though lyrically it may be their strongest. I feel like instrumentally it's just very bland compared to all the other albums. It has a few interesting bits, but they often don't pay off for the song. Not to mention it feels like they tried to get the American Idiot vibe too much, along with a bit too many ideas that they'd already done before, or seemed too little like Sum 41, and too much like another band. Underclass Hero seems like the political take on Fat Lip, not to mention the chorus being a recycled chorus of a Chuck B-side, Count Your Last Blessings is a song about addiction that at times is way too much like Angels With Dirty Faces (and noone can help me), and there's King of Contradiction, which is basically the exact UH version of Welcome To Hell. Still awesome song tho. Walking Disaster is a good song that still somehow rarely makes it to my playlist. The Jester is great, Pull the Curtain fucking amazing and I think on of their most underrated songs. Still I feel that like 88 it has bits and pieces that deserved more developtment than they got. So long goodbye and look at me are very nice acoustic songs and are an ok way to end the album. Main issue with it is so much of this album blurs together. And Ma Poubelle

.Bonus tracks are ok.
Screaming Bloody Murder. Took me a while to get into it, but I fucking love it. Deryck was a bit all over the place and so is the album, which results in so. many. good. bits. but also results in a bit of a lack of cohesion which would've helped in having more single type songs. Only songs I don't really like are the late additions, TFYTG and BYDWK, which happened to be a single. For the rest, it has A Dark Road Out Of Hell, which I love so. fucking. much. Basically love every song except the late additions. Think it's their best vocally as well. Reason To Believe is among my favourite ever album intro songs.
13 Voices. Feels like a more cohesive and comprehensive mix of Chuck and SBM. Ironically, SBM seems like a man descending to hell whereas the real dark road out of hell seems to be 13 Voices. Overall, it's a bit less heavy in ideas and variation then SBM, and sometimes a bit too many effects than I feel are necessary. The only 2 songs with a really deviating structure are the first 2, and after that the songs almost all have the same structure of building up to a big chorus in some way. I think that's kind of a shame as I love longer, more complicated songs and Sum 41 can be fucking great at it. Still I'm in love with many of the songs though. Bonus songs are pretty good as well, though they seem a bit unfinished. Black Eyes kicks ass.
Overall, it's clear for me that 13 Voices, Chuck and Screaming Bloody Murder are their best albums. Don't make me pick one.
Overall