Deciding on frame rate is part of that decision. The 4096 flavour only comes in 24p while the 3840 gives you 30p. 24P apparently has a very high judder during pans. Much more than would be expected for the lower frame rate or for cameras and even film at the same settings. Do a Google, there's a fair amount written about this. Unless you want several timelines, or have a specific need, or just feel that 24p has better sales potential with the slightly wider view, then to me, 30p at 3840 would be the choice.