The Sonic 3 fan decompilation soundtrack that finally puts the prototype tracks and the retail tracks side by side. Angel Island Revisited preserves every version of these legendary compositions so you can actually A/B them yourself.
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Hearing Carnival Night Zone's prototype version next to the final release is fascinating, completely different energy between the two. Ice Cap Zone's prototype tracks carry that unmistakable early-90s vibe that the retail version built on.
Hydrocity Zone still has some of the best basslines in any platformer, period. The inclusion of Knuckles' Theme in its original Sonic 3 form is a nice touch. Just perfect Genesis FM synthesis all the way through. If you've ever argued about which version of these tracks is better, now you can settle it.