score:1
Results of quick online research:
Point of comparison: a BOG-MDE flight from VivaColombia (for tomorrow):
So, cost being about the same, even with the airport hassle (getting to/from + waiting; maybe 2-3 hours total?), 10 hours is a lot, maybe a bit too much.
Feel free to post better answers, especially if you have first hand experiences. (How about safety on the bus trip & at the terminals? If you take a night bus are they good for sleeping?)