What is the best and worst Natural Wonders in the game?

For me the best is El Dorado because it gives you a whopping 500 Gold just for finding it! The worst for me is Krakotoa which is usually out of reach of any possible City Radius and therefore pointless.

For me, since i play heavy Sci/Religion it would be Crater/Fuji esp when i mix it with Enlightening (Type of Surrounding Tiles) (+1 Science in all tiles of said tile type) and mix it with one of my fave mods regardless if the tile is said or not all tiles produce +1 Science regardless (Advantages of the Brotherhood of NOD)

The Worst however is kinda hard to say except for El Dorado which gives +5 Culture if worked but first to see it gets +500 gold if i remember correctly

Yea, El dorado can also be a good favorite wonder since it gives that good gold payment at the start, especially with Spain.