It's not finalized, but here is my controversial one.
Best: Season 9 (Mostly after the second movie. The first third was good too, I found the episodes there to be pretty entertaining, but the comedy reached it's peak after "Spongebob You're Fired")
Season 5 (Although the show is mostly meant for comedy, I think this was the best season, story and character wise. It's not akin to Avatar or Steven Universe, but there are some interesting stories with characters getting a bit more traits than normal)
Season 2 (A vast majority of the episodes in this season, are ones that I remember fondly, mostly because this was the season I grew up with, but most of them are pretty funny too.)
Season 3 (It was tough to choose between this and Season 2, but after thinking it through, there are some pretty weak episodes in this season, while 2 has all of them hit the mark)
Season 11 (Although it's a bit over animated, much like season 9, there are a lot of interesting yet ridiculous ideas in the season, and I kind of like it)
Season 1 (It's kind of weird having this season be more slice of life style than the other, more zany ones. Not that it's a bad thing, just something I'd thought I would point out)
Season 8 (Although home to my least favorite episode of the series, the season as a whole is pretty good, with some very interesting episodes thrown in there)
Season 10 (Also over animated, and outside of a few episodes, not a lot about the season stands out. Still pretty good though)
Season 4 (Similar case to the above, except without being over animated)
Season 6 (I've realized that this season has some really good and really bad episodes, not a lot in between, so it's a more average season to me, which isn't much when compared to the enjoyable other seasons)
Worst: Season 7 (Even some of the best episodes of this season, were not all that memorable, I usually just forget about 98% of the episodes here)
