Hey there ...welcome to the forum!!
I have Taylors both in the 11/16th and 3/4 nut width. There is a difference, but it is indeed subtle; only you and your preferences can determine whether the difference is insignificant or a deal breaker.
If I may use myself as an example, I had a 210E that I "liked" well enough, but the 11/16th nut width kinda bugged me. That was years ago. Fast forward to now where I have a DN-E where the very
same nut width feels great and I
love this guitar. OK, so makes no sense, right; what gives? Well, it's everything
in sum. Where on the 210 I had convinced myself that the nut width was part of the reason I "couldn't bond" and so needed to sell it, when in reality it had to do with the overall guitar and my brain likely just zeroed in on that one difference. If the guitar sings to you, then the minor diff in width may not even play a role in your head.
On another Taylor with the standard 3/4" nut, not only do I find myself having no problem going back and forth, I don't even notice the difference ...except maybe when I have to do a thumb-wrap for a bass note, or more fingerpicking, then the minor difference in neck width plays a role, but not enough to make either guitar a "deal killer."
Bottom line is play both (all 100/200s are 11/16th nuts) and decide yourself which is the more comfortable. Side note: resale may be a bit tougher for the narrower nut, not that this is a primary concern, but lets face it, we often tell ourselves "this one's gonna be a keeper." And Michael raises an excellent point about T5s and their narrower neck carve. Check that out, too, as carve and nut width are items you can "check off" should you choose to mod a model. Just food for thought.

Edward