Price is important but there is almost nothing between the 8000 and the XT, having sold Bosch powered bikes for more than four years we were very much into the Bosch system, and our new GSM Jeremy worked for Magura selling Bosch systems until he joined us six months ago. Although we were definitely leaning towards Bosch, as this was an important choice, one we have to live with for a long time, we were more interested in choosing the best motor with the best support structure for the job. For many reasons Shimano MTB8000 was the unanimous choice.
We believe for usability the hub motor is better for City and Trekking bikes, lower maintenance costs, quiet and efficient. The Crank motor is better for mountain biking, running the power through the gear system and on the whole mountain bikers maintain their bikes, are more tech savvy and don't mind changing chains and gear sets when needed. Regarding safety there is really no difference.
Don't worry about the clinking and clanking, a properly adjusted derailleur set is superb.
All the best, David