<shrug> I 've had different brand tires on this bike (05 FLTR) as well as others... YES... I prefer to have both the same, but you have to do.... what you have to do.
I never cared for the OEM Dunlop D-402 that were on this bike, and I swapped the pair out very early for a set of Metzler's, as I had great experience with them on a previous bike. Well that, and the Indy shop ordered the wrong Dunlop Elite-3, but had the Metzlers in stock......
I wasn't to happy with the wear on the Metzlers... great grip, but lousy wear (about the same as the D-402). When the rear was shot, I put an Elite-3 rear on, with the existing M-880 front... Not a problem...
13k later when the Metzler front was worn... I replaced both with the E-3. From the 20k mark to the 80k mark... my bike wore the E-3's.... I was very pleased with them... good wear, yet had good grip. An onymoron, but true.
This year, after reading about how improved the Michelin Commander II's were, I took a chance, and bought a pair.
Still too new (4500 miles) to tell... but as grippy and the metzlers, and look brand new
Buddy has the Avon on his Ultra... but just mounted them.... he's had issues from the D-407/8 as well as the "American Elite"...might be his bike... dunno... he keeps a close eye on air pressures, but on his bike, he's had "cupping issues" from day one..