Can only speak for what I've used, that work for me... My criteria is 1) protection; 2) comfort; 3) price; 4) design (in that order).
After *lots* of different boot trials, my favorites are:
for Cool weather: : 1- S&S Urge Overkill. Insanely comfortable, lots of protection (covers the talus bone like the Response 2.0, but doesn't have laces (I don't recommend laces in a riding boot). They're also waterproof, and can be worn year round.
2- A* SMX-5 comfortable, despite being calf-high. Lots of protection, however, probably better suited to sport bikes, and too warm for summer unless you get the perf version.
Warm weather: S&S Moment of Truth. Same sole, and feel, as the Urge Overkill (also incredibly comfortable). Slightly shorter, easy on/off. You can easily hike in both the Speed and Strength boots.
Oh, and the S&S run a Euro size large, and they're excellent if you have a wider foot.
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
GPI spools, SW Motech risers
Givi XS307 Tanklock bag and Givi 46L top case
Suzuki hard case saddlebags