It's not an easy decision. My preference would be to have one of each in the hangar
I was in your shoes 2 weeks ago. I'm a 230hr pilot (90hrs tailwheel) who is now the proud owner of a sweet RV-6A. I've put 14hrs on it in the last 2 weeks including aerobatics and night flight, so I've had a sampling of what it offers.
For me, the deciding factor was mission. My wife and I plan on using it as a travel machine. We did our 1st day-trip to the beach last weekend and that was a very cool thing. Almost all of our destinations will be paved, and several hours away in possibly different and challenging weather conditions. Our 1st trip also confirmed that I made the right choice for me.. I landed at Savannah in a 7kt crosswind component and departed in the evening with a 15kt direct crosswind
The nose wheel handled it fine. A tailwheel in those conditions would have been more 'entertaining'.
If your missions shows you're based out of a grass strip or plan on flying to many grass strips, I'd say that the tailwheel is preferred. I do plan on flying to the occasional grass strip, and the A has proven over many thousands of hours that it can do that just fine; however the tailwheel is the better tool.
I HAVE seen a Cessna 195 nose over on a grass strip. Any airplane going into a soft grass strip had better be paying attention.
Just taxiing my 6A with my arm hanging out of the sliding canopy with Excellent visibility over the nose and Very easy ground handling behavior has kept the RV grin on my face for 14days straight! I'm based at a field with 29 flying RVs, and many of them are tailwheel. I've received the 'training wheel' jabs. Nose or tail wheel, it feels like you've become a rock star landing a RV at any field.
You've left out the other major decision.. tip-up vs slider
For ME in the Georgia heat, the slider fit the bill.
Good luck on your search! I still can't believe there's a RV in my hangar!
Brian