Best Minecraft Mods?

What is your favorite mod? Single-player or online. :)

I haven't played modded in a while, but some of my favorites were Pixelmon and the Natural Disasters mod. The latter had tornados and stuff flyin' everywhere and wreckin' everything, lol.

I MAY or MAY NOT have gotten into a little mischief with the Xray mod on servers as a kid (but those are just rumors, like Herobrine). 🫢