Coarse Stone vs Large Obsidian Shard

Side by side:

Set your class weights in Preferences to see which is better for you.

Δ is Large Obsidian Shard minus Coarse Stone: green where Large Obsidian Shard is better, red where it is worse (a lower required level is better; speed and sell price have no better side). Total Stats adds up Str, Agi, Sta, Int and Spi.