I remember a while ago this topic coming up, and at that time I had not know enough about 3DCoat, but since did look a bit further into it, but must say I havent spent huge amounts of time using it.
My research found from other forums here is one to check out of many. that Zbrush is the sculptors choice if you want the best feedback, and feel from the strokes, of course your best off trying both, but I found 3D coat didnt give me the same brush stroke feedback. I use a Intuos 4 Tablet.
If your looking for a out n out sculpting tool not taking into account its other usages then id have to recommend Zbrush, but what I will do today for you is get the demo again, and do a side by side comparison again to verify my thoughts. Before I learnt any 3d modelling at all sculpting was my first experience in 3d so have grown with Zbrush from v1.5, this gives me an advantage of being fed more features as time has gone on to allow me to adapt to its UI.
The number one thing I see crop up againts Zbrush is UI, second its price. Your need to decide at the end of it if the UI will be a big issue or not, and if pure sculpting feedback should have priority over 3Dcoats attractive price, and better topology tools which they are by a long shot.
Dan