The termination temperature rating is the first to be considered. If the device -is- temperature rated, then that is the temperature you use for the calculation. If the device -is NOT- rated, then the 60 deg. C rating applies regardless, and conductor ampacities must be selected from the 60 degree column.
The temperature rating of the conductor is then considered. It might be advantageous to use higher temperature rated conductors even though you are using a conductor with a lower termination rating as the cross-sectional diameter is smaller (typically) and that affects the fill rules.
Maximum ambient temperature of the installation location needs to be considered, too. If the conduit is run on the roof (for example) exposed to direct sun, you'd need to further derate for those temps (usually scorching hot) and the wire gets big real fast.
So on and so forth...
Derating and fill calculations are *so* much fun...lol.