I gather that I defy consensus with my views on what the strongest points of each Turbo Bonk episode are. Adventure ranks as my favorite of the bunch, as it offers the tightest controls (which allow for smooth spin attacks), brilliant tunes in their marvelous original forms, a memorable and charismatic band of bosses, and the most nostalgic value. I consider Revenge a decent followup that flaunts superior graphics and stage designs.
And then there's Bonk III. It delivers large and diminutive Bonk forms, which are amusing for about thirty seconds before seeming silly and gimmicky, if not utterly pointless.