The 'default' config is the one used by default (surprise), but any will work (or simply edit the default one to suit).
Source for the configs and info on how to tweak them - https://forum.xda-developers.com/mi-5/how-to/how-to-disable-thermal-throttling-t3636574
Qualcomm docs for the interested - https://developer.qualcomm.com/qfile/28825/lm80-p0436-8_thermal_debugging_guide.pdf