Mmm not really sure.
Apparently the 1199R 2015 is faster than the 1299S but you are talking silly fast anyway. The 1199R needs to be a 2015-on bike though. I believe its noticeably better than the 2012-14 bike, which had electronically adjustable suspension which the 2015 doesn't.
If it were my money it would be 2015 1199R, then a 2015 1299S and lastly the 1199R 2012-14.
The 1299S has a lot of the equipment that the £50k Superleggera had other than the magnesium bits.
1199R 2015 has a full titanium exhaust system as standard but the other two don't.
There is a nice little comparison checker on the Ducati website so you can add the bikes you are interested in and compare the features.
http://www.ducatiuk.com/compare/index.d ... alue=false" onclick="window.open(this.href);return false;