Tough to compare; they are so different.
Stone Eagle's is 499 yards with a steeply downhill tee shot. Around 300 yards from the tee, rock formations pinch the fairway down to only 30 yards or so. The second shot is level to slightly uphill to a green, guarded by a family of bunkers on the left two-thirds of the green. There's a big bailout chipping area on the right, and the green is severely undulating, with a major elevation change from the low front right pin locations to the back center and left locations. Second shots to left and center pins are extremely tough. It is a very hard par 4. 3 wood, the push 7 wood to the bailout area, run the chip over the ridge, 2 putt from 20 feet. Bogey.
There's a potential flaw in Stone Eagle's 18th, as I have heard anecdotes of players having a better angle by driving way right into the 17th fairway.
I am less familiar with Ballyneal's 452 yard finishing hole. The drive is about level to a wide, gently undulating fairway. There are at least a couple of fairway bunkers on the left side to guard the inside of this gentle dogleg left. Once again, the left 50-60% of the green is guarded by sand, this time a single bunker. There's room to miss right. The green is large and pretty flat, as one might expect for the hole with the flattest terrain at Ballyneal. 452 yards won't play too long at 3700 feet elevation, so I expect the typical play here for me will be driver, 6-8 iron to the right side, 2 putts for par. It's a medium difficulty par 4.
The 18th at Stone Eagle is a wonderful hole, but there's something really special about Ballyneal's 18th that's hard to describe. After playing all day in the dunes, the final hole is gentle and grand. It's early to pass judgement, but right now it's one of my favorite golf holes anywhere.
It's great to hear the stories from friends playing the new courses. Gotta go; back later.