Of course the selection of any motor should depend on the job that motor should accomplish. At the same time we've all been in the situation where time and other resources are limited so we must settle for what components and funding are readily available.
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"Don't disturb my circles." translation of Archimedes last words
It's the maximum torque that the motor can develop without an abrupt drop in speed. You select it by superimposing the load's speed-torque curve on the motor's speed-torque curve. If the load torque (including the effects of load inertia) is ever greater than the motor's developed torque at any speed, the motor will not be capable of accelerating the load above that speed.
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“Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
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