The second one - loping along @ little more than an idle, then trying to accelerate quickly, without a downshift - or attempting a long, steep grade, without a downshift, is lugging.
Different power bands and torque ratings can make a difference. When I switched from a flat six cylinder Gold Wing, to v-twins (with a lower power band), I noticed I was spoiled to throttling up (w/o an upshift) out of a cruise, or up a steep grade. I noticed the V-twin (Harleys and big twin Vulcans) needed a downshift to accelerate similarly, out of the same low rpm cruise. I adjusted my riding style, but only slightly. I had to downshift a Gold Wing, occasionally - just not as much as I do on my big twins. In past, I did have higher reving v-twins (Virago, C-50, & Vrod) that didn't have that same degree of lugging, but you rode at a higher engine speed, so it is relative to the power band.
I doesn't sound like you are lugging, though. I admit that I tend to just lope along these days!
Last edited by Hathaway; 05-21-2019 at 10:02 AM.