The lower BB will put you lower on the same bike. That improves the handling (lower center of gravity) but increases the likelihood of banging or scraping a pedal.

That's one of the major differences between a cyclocross bike and a touring bike; the cyclocross bike has a higher BB for obstacle avoidance.

Low BB is good, unless it's too low. 77 mm drop sounds good.

That said, there are many other differences between the Aurora and the Marrakesh so I doubt I could pick out the difference in BB height. If it were the exact same bike otherwise, you'd probably notice the difference.