Whether or not a particular specification of stepper motor is suitable depends on which electronics you use, and what power supply voltage you use. So please tell us. In the mean time:
- To get high speeds from 0.9deg/step motors (which both of your suggestions are), you need 24V power and compatible electronics.
- Your first suggestion has high inductance AND is 0.9deg/step, so it is not a good match for any common electronics
- Your second suggestion(the 17HM19-2004S) would be an excellent choice if you use Duet WiFi electronics. Also OK for Duet 0.8.5 and Smoothieboard. Less suitable for boards with plug-in drivers because they will struggle to supply enough current without overheating.
- To get high speeds from 0.9deg/step motors (which both of your suggestions are), you need 24V power and compatible electronics.
- Your first suggestion has high inductance AND is 0.9deg/step, so it is not a good match for any common electronics
- Your second suggestion(the 17HM19-2004S) would be an excellent choice if you use Duet WiFi electronics. Also OK for Duet 0.8.5 and Smoothieboard. Less suitable for boards with plug-in drivers because they will struggle to supply enough current without overheating.