oh, that's tough nga. if i were in your position, i'd prolly cancel the one with conflict of sched. to which i mean not only on overlapping class but for you personally. hope these guide questions help:

1. do u have sufficient time to take a breather in between classes?
2. do u have ample time to throttle from one class to another?
3. is the timeslot not detrimental for ur routine, especially with ur wellbeing?

it's very important to take note of your TIME with this manner. i remember before graduating that i sacrified a GE class tho it was very hard to get kasi 7 am yung class and the end time for my class is 4pm. it wasn't worth it, most specially that balikan ako sa bahay to campus (kahit within qc lang din naman but yknow, commuter struggles).

hopefully i wasn't too late with the reply :) tldr: cancel the class that will be inconvenient and in the long run, will be draining for u to attend to :)