This will prolly be my all time favorite hub as disk brakes are the best for my riding and over all personal expectations of handling.
http://motorbicycling.com/showthread.php?t=10509
For me it is not a big deal at all to add a right side disk brake mount to a frame. All I use are steel frames for the most part. This approach for a good disk brake works good for me. Recently learned just how easy it is to build/spoke my own wheels for myself too!
A friend of mine has a top hat adapter and it works perfectly for his needs. Never complained about it.
So I voted for disk brake mount type. The sprocket gets mounted on like lugs nuts on a automobile wheel. Never have had hardware come loose on me ever!
I have one of Dean's sprockets and one of Andy's with this type hub there both great.
My old china bike had a 30 tooth disk brake mount sprocket from Andy as well with a rim brake.
Never was a fan really of coaster brakes. I hear they work great for folks. Just that got used to moving my peddles every which way, which spoiled me.