Nice data. My subjective experience has been that the UDisc is rating is almost exclusively a rating of the maintenance of the course. The quality of the holes, distance of the holes, or in a lot of cases even the number of holes seem to be irrelevant. The DGCR rating is much more reflective on the quality of the holes, etc.
Both are useful. I find DGCR much better for determining what courses are "must plays" and you should build a day/trip around. I like UDisc for decided which "filler" courses (usually the 9 hole ones) are worth the time to play and which are more of a headache than they're worth.
For instance, a 9 hole course that is all 150 foot holes with natural tees but zero navigation or maintenance issues is probably a 3.0-3.5 on UDisc and probably a 1.5-2.0 on DGCR. Likewise, an 18 hole course with decent holes but a super confusing layout and no signage and tall grass everywhere is probably still a 1.5-3.0 on DGCR but is much more likely to be a 1.5-2.5 on UDisc.
I've gotten to where I really don't even bother with stuff with low ratings on UDisc because those always seem to be the ones I wished I hadn't bothered with before I started looking at UDisc. I don't mind playing 15 minute 9 holers or 45 minute 18 holers though-- which often still have low DGCR ratings.
Both are useful. I find DGCR much better for determining what courses are "must plays" and you should build a day/trip around. I like UDisc for decided which "filler" courses (usually the 9 hole ones) are worth the time to play and which are more of a headache than they're worth.
For instance, a 9 hole course that is all 150 foot holes with natural tees but zero navigation or maintenance issues is probably a 3.0-3.5 on UDisc and probably a 1.5-2.0 on DGCR. Likewise, an 18 hole course with decent holes but a super confusing layout and no signage and tall grass everywhere is probably still a 1.5-3.0 on DGCR but is much more likely to be a 1.5-2.5 on UDisc.
I've gotten to where I really don't even bother with stuff with low ratings on UDisc because those always seem to be the ones I wished I hadn't bothered with before I started looking at UDisc. I don't mind playing 15 minute 9 holers or 45 minute 18 holers though-- which often still have low DGCR ratings.