There is a huge difference between the two. BB is a wonderful coach, but personally, comes across as a jerk, someone who doesn't give a damn about anything but his team, his agenda and himself. If he has a nice side, he hides it well. He is the kind of coach that people love to hate because he makes it so so easy to do so. He is bright enough that he probably does it deliberately to take pressure off his players. And none of this says word one about the cheating issues.
At his worst, Geno is a wiseass, probably for the very same reason. But over the years, his record has earned him respect -- sometimes grudging, but respect nonetheless -- from everyone except some in the TN fan base. His role as a teacher, and as coach of the Olympic team, have contributed to this. He wrelcomes other who want to learn and schedules opponents to help their teams get off the ground. He has taken full advantage of opportunities that have come his way to demonstrate kindness (consider his words and actions when Pat's Alzheimer's was announced, and after her death).
Miles apart, IMHO.