My 2018 AL8, is fitted with Dunlop Roadsmart 3s.
According to MCN the rear Roadsmart 3 lasted 19% longer than rivals from Bridgestone / Pirelli / Metzeler and Michelin when tested in 2016............
..........Maybe, maybe not, all I do know is that after a whopping 3400 miles on the back of my SV it's down to about 3mm
As I mentioned in the brake discs thread, can get a 20% discount on M&P stuff through ebay at the moment (last day today) so have just bagged a rear Storm 3D for £71.
I've always rated Avons on cars and bikes, I believe that Avon still develop and manufacture tyres in the UK and I think there is probably something to be said for a manufacturer that fully understands UK road and weather conditions.