A square rainfall shower head system like this is commonly used in modern bathrooms. The square rainfall shower head set includes a fixed overhead outlet. The wall mounted twin shower system fits into standard wall installations. You see this type quite often.
With the square rainfall shower head system, water falls from above in a steady pattern. The square rainfall shower head set covers a reasonable area, not too concentrated. The wall mounted twin shower system works under normal pressure conditions. Nothing unusual about that.
There is a basic switching function in the square rainfall shower head system. The square rainfall shower head set stays in position once installed. The wall mounted twin shower system operates directly when in use. No extra adjustment needed.
The square rainfall shower head system uses standard materials for daily use. The square rainfall shower head set includes components that handle moisture over time. The wall mounted twin shower system is made for regular use. It generally holds up.
During installation, the square rainfall shower head system can be positioned as needed. The square rainfall shower head set allows slight angle adjustment. The wall mounted twin shower system does not require exact alignment. It works either way.
Maintenance is simple enough. The square rainfall shower head system includes anti-limescale nozzles. The square rainfall shower head set helps reduce buildup. The wall mounted twin shower system can be cleaned with standard methods.
Installation follows a familiar process. The square rainfall shower head system mounts directly onto the wall. The square rainfall shower head set connects with standard fittings. 
Overall, the square rainfall shower head system is built for everyday use. The square rainfall shower head set keeps things consistent. The wall mounted twin shower system works as expected.