I suppose it depends on the kind of golf that you're after. If you're after playing on a championship level course, choose Milo, if you're after some bucolic frisbees-in-the-woods type golf, go Horning's. Both are great, though I maintain that the sum is greater than the parts at Horning's. The courses are average to above average on their own, but the setting and having all on site make it a destination. Also, depending on how seriously you take your game, some people have issues with the baskets at Horning's.
From a pure golf standpoint, Milo is superior. BionicRib is correct about the BSF layouts being the best, but the 27 hole layout is great too. The one caveat I'd say is that it's a much less impressive experience if the baskets happen to be in the short positions.
If it were me and I could only pick one, I'd probably go for Milo, but you can't go wrong with either one.