I don't have an agenda here as while I currently run an Ellsworth Moment MK1, it's a temporary bike until my Nicolai arrives. I have ridden an Epiphany and the old Horst Link Five Spot, but not the new DW link one.
First off you should test ride them both. Freeborn in Horsham and Esher, are the retailer and the importer of Ellsworth so they can sort you out with a test ride. Call 01403 251 252 and ask for Paul 1 or James and they will sort you out. If you're down this way, Nirvana cycles also have a Five Spot (the new DW link version) that you can also test. Nirvana are in Westcott. Your test riding will be Leith/Pitch/Holmburry Hill, all excellent venues.
There is a big difference in price between the two as Freeborn can be far more competitive on price then other boutique brand frames. If money is an issue, then go for the Epiphany (or the Moment as there is almost no weight penalty and the geometry of the Moment is more relaxed) and spend the money you save on a really good fork, wheels or something.
Freeborn will always sort you out with any warranty issues, I think the warranty on Ellsworths is two years. Again, being the retailer and the importer they are in a better position to sort out any problems than a Turner retailer will be. But that's not to say you won't get the same outcome, just that you've got an extra layer of communication to work through if you buy a Turner.
Both the Ephiphany and the Horst Link Five Spot pedal extremely well. I think NorthCountryBoy sums them up very well; the Moment will reduce the flex issus he refers to but will add a little weight (albeit no much). I've nothing empirical to base this perception on, but the Turner looks to be the more robust construction; maybe it weighs a little more.