If I'm updating to 1.17, will it keep every Aristoi's option (like alts, pinned mods, mods config, etc...)
If yes, then I'll switch to 1.17 as soon as possible ^^
Not by default, but its very easy to move over all of your settings. Copy .minecraft/libraries/EMC/1.16.4/configs to EMC/1.17.1/configs