I think Super Bonk 1 and 2 are better than the Turbo Bonks. Mostly, I feel this way because the SNES games looked and sounded better. Honestly, all the Bonks seem to play exactly the same. Super Bonk had a small handful of actually gameplay upgrades which seemed to help.
Super Bonk and Bonk 3 looked very close to one another, but I feel the Super Bonk was a lot more refined. The graphics were marginally better, and the music (some) was a good deal better. Super Bonk 2 has entirely new graphics and audio compared to those others. I think Super Bonk 2 was likely 100% new material, including a new game engine.
I'm not trying to say the Turbo Bonk games were bad, because that isn't the case. I just appreciate the fact the SNES versions had upgrades that were synonymous with the platform. Whether anyone likes it or not, the SNES typically had the best looking/sounding games of the day, because it had better hardware. The Bonk games reflected this (although barely).