The one w/the knob won't work w/double springs and heavy springs can be a problem. But it's OK for stock and mild performance springs.
Valve Spring Removal 101, Lesson 1: Loosen the locks before compressing spring. Use a large socket that will allow you to put force on just
the retainer/spring and NOT the tip of the valve. In other words- hit the valve retainer- not the valve tip. A rubber mallet works fine, dead blow, fine- just do not use a steel hammer against steel. You can use a piece of wood atop the socket and hit THAT w/a steel hammer, if need be.
A cheap tool that will also work for mild springs. It goes over the stud, use a non locking nut to tighten the tool against the retainer, not a lock not or polylock you're going to reuse:
And a more expensive tool for heavier springs: