I'll give a different view, if you're in a casual guild, I'm going to guess you're a casual player, in that case, you should farm whichever makes the game fun for you, if you really want to max wampa, go for it, or if you have favorite toons like Aasajj or Savage, then max them out...if your goal is to progress in the game beyond a casual player, you should strongly consider graduating into a more serious guild and grind, grind, grind. Good luck, either way!