Which is better to control water flow/temperature?
If you go to the McMaster-Carr web site they have a description of both valves and their applications.
On the gate valve they recommend for full open or closed application only.
On the globe valve they say it can be used for throttling applications and adjustment for flow rate.
The globe valve sounds like it would be better for use on the incoming water on the jet pump.
Which one do you think is better?