Board Thread:Off Topic/@comment-23371555-20131010041905/@comment-5569775-20131222124119

From personal experience, as far as leveling Enchanting from actually Enchanting items, it's easier to just pick up all Soul Gems you come across and buy all unfilled ones from merchants than using either Star. And if a Grand Soul Gem is filled with a smaller soul, you can just drop it, then pick it up again and it will be empty.

As far as leveling Enchanting by using Soul Gems to recharge your Enchanted weapons, it's more conservative to use the whichever Star you wind up getting.