I have two bathrooms back to back. one with a tub and shower and the other is a walk in shower. Both have the same shower head. One has super pressure, the other is eh. What do you this causes this?
In the US, there is a law that a shower head can only put out a certain amount of water. Depending on the design of the head, there might just be a little filter/stopper piece that can easily be removed from where it screws into the pipe. Some people remove the restriction device to have "more pressure".
If the shower heads were installed by a previous owner, it's possible that one has been modified to put out more water.
Also, some shower heads have an adjustable spray, but the adjustment method might not be obvious. Some rotate, some have a lever, etc. Look at it close and make sure you're not missing anything.