I don't fit the criteria you raised of a "PWD that have used both the Animas Vibe and the Medtronic Enlite". I currently use a Paradigm 723 (same as the 523 only bigger) with Enlite sensors and that's all I have first hand experience with. But I'll throw out my two cents.
Stop trying to decide this on the basis of the CGM and just pick a pump you'll be happy with. The truth is that as a current Dexcom user you are will most likely not be satisfied with the Medtronic CGM. At least this seems to be the pattern from the posts I've read on discussion boards and in blogs.
I am personally happy enough with Medtronic's CGM. It does work. And it works well enough for me. But the truth is that Medtronic's CGM can be finicky. Getting it to work properly can require a level of fussiness, of attention to nit-picky details that Dexcom users typically have no patience for.
So I expect as a current Dexcom user these design limitations of Medtronic's CGM would both nag at you and very possibly lead to the Enlites returning incorrect & misleading glucose results.
If you can somehow convince Medtronic & your med support team to give you a trial run with the Enlites for at least a few weeks, then I would urge you try it out and come to your own conclusions. But if you have to decide a priori, without hands on experience, then just stick with the Dexcom and decide on the pump for other reasons.
-iJohn
