I've been playing for about 5 days now and like what I see. A lot of the problems I had with the game have been fixed. So now I'm wanting to progress and I had a few questions about crafting. If anybody could help me with some answers I'd really appreciate it

1) What's the difference between Medium Quality and the 1st stuff you can train in for armor? weapons? jewelry?
2) Is it worth it to upgrade to Medium Quality stuff?
I guess that's really my only questions at the moment...hehe Any help or advice is greatly appreciated. I look forward to meeting all of you in game and someday hunting with you. Cheers!