Back to the original reason for this thread. Why are DGCR and uDisc ratings of a course different? This is my opinion on the topic.....
The users. Period.
When I started playing, I heard about uDisc from other players.
I only found out about DGCR when I did a search to find an answer to a disc golf question.
Basically, any/every disc golfer knows about and uses uDisc - from a first timer to a long-timer. How a course is rated will differ between a newbie and a long-timer.
DGCR isn't well known. Yes, there are newbies to disc golf on it....heck, there's a part of the forum just for them. But (IMO) it is the players who have been around a while who have found DGCR. Those players are more familiar with different course and can better rate them.
If DGCR were more widely known, I think the course ratings would become comparable to uDisc. But for now, I think DGCR is more accurate due to the experience of the members doing the ratings.
It is also easier to do ratings on uDisc since it asks for it after you finish the round....and it is easy to rate a course low if you just had a bad round...or high if your round was great. With DGCR, the rater is going to the site after the round and they have had time to think about what the course was like for them....so it would be a more accurate rating.
uDisc rating: "knee jerk"/at the moment.
DGCR rating: "thought out"/after the round.