It will take you awhile to find out what type of pressure is desired.
You want the joining faces to have no gaps. If you use the clamps to close gaps, the wood is stressed and can result in future problems.
With the parallel clamp hand screw, I may apply more pressure than others.
The key is that the clamps are applying consistent pressure and all parts of the joining faces are touching. Not easy to see with the squeeze out, but any gaps will jump out after you have removed the squeeze out.
The parallel clamp are the best for applying even pressure, but even this design it is possible to apply more force on one edge than another edge resulting in a gap due to the clamp. Been there, done that. Not fun.