Shower heads fit into two main categories: fixed head or hand held. Each of these work differently and have their pros and cons.
Fixed head
Screwed to the wall or ceiling, these give a designer look and, as the spray is fixed, there’s no danger of accidentally soaking the rest of the room. It’s not the handiest for cleaning, though (or washing a squirming child). Also, it can be costly to instal and repair as the pipework should be hidden in the wall.
Hand held
Slots into a bracket that’s either fixed to the wall or on a riser rail so you can adjust its height, connected by a flexible hose. These don’t look as sleek or streamlined as fixed heads, but the great advantage is that you can detach them for focussed rinsing and easy cleaning of the shower enclosure.

House to home,(online).http://housetohome.com.uk/articles/Fixed_head_vs_hand_held_124879.html(page consulted on May 10, 2012)