My Top 10 seasons are probably (in no order)
-Season 3
-Season 5
-Season 7
-Season 11 (All-Stars) (I recommend watching watching season 1-3, 5, 7, 9, and 10 before watching it)
-Season 12
-Season 14
-Season 17
-Season 18 (Unfinished Business) (I recommend watching seasons 12, 14, 15, 17, and if you want 16 before watching it)
-Season 21
-Season 25
-Season 27