Now that the Mod Loader is installed, here are the specific mods that justify switching to the decomp version. You can find these on GameBanana or the Sonic Mania Modding Discord.
Sonic Mania Plus Decompilation is the Ultimate Way to Play Sonic Mania Plus sonic mania plus decomp better
To use the decompilation, you must provide your own legitimate Data.rsdk file from a purchased copy of the game. It is a tool for owners, not a free version. Now that the Mod Loader is installed, here
: You can easily toggle Encore Mode and other DLC content (provided you own the assets) through simple config tweaks. sonic mania plus decomp better