Wow. I was not expecting dry erase vs permanent to be the idealogical battle of the day!!
Lots of good ideas here.
Personally I will use whatever I have on hand. Either one works. If hitting short irons or you are more of a digger, the permanent seems to hold on the face better, but as mentioned above you can also hit off mats and not have those issues.
If you have a darker finish face that is hard to see, you can masking tape the face to do the test.
Course Rating is 68.8 at this course, so it's not is a super difficult course for a pro. It's pretty short, too. 6100 yards is on the short end, even for a muni. Bubba's differential was -6.2, if the online calculator I used is right. Interesting to see.