JMO.
http://www.dunlopmotorcycle.com/
Dunlops are by FAR the better tire company. Their tires are much more specific and Dunlop has decades of racing technology.
Also, most are built in Buffalo, NY.
What comes on a Harley stock is Dunlop's all around, moderatly priced imported tire. If you look at a stock HD tire as a barometer for Dunlop, you've made a mistake.
Avons or Metz tires? I guess they are a decent "one tread pattern fits all" comparison to a Dunlop Qualifier D401 if you want a different tire label, but not in the same league as a specific Dunlop.
For long distance wear, I would go with a Dunlop E-3 radial

.
If you want great handling, go with one of their high performance street tires.
Load ratings:
SIZE LOAD/ SPEED INDEX SIDEWALL PART # APPLICABLE RIMS
RECOMMENDED RIM OVERALL DIAMETER OVERALL WIDTH FULL TREAD DEPTH MAXIMUM LOAD @ PSI
Elite 3 Radial Front
150/80R17 72H BW 4080-92 3.50 26.77 6.16 5/32 783 @ 41
130/70R18 63H BW 4080-78 3.50 25.26 5.08 6/32 600 @ 41
120/70R21 62V BW 4080-97 3.00 3.50 3.75 27.61 4.83 6/32 584 @ 41
Elite 3 Radial Rear
180/60R16 74H BW 4080-56 5.00 24.39 7.16 9/32 827 @ 41
180/70R16 77H BW 4080-82 5.00 26.06 7.13 10/32 910 @ 41
240/40R18 79V BW 4080-88 8.00 25.91 9.29 12/32 963 @ 41
250/40R18 81V BW 4080-99 9.00 26.20 10.02 8/32 1019 @ 42