Fixed or Flex?

What do you guys and girls do for the shower heads in the bathroom?

Im thinking about a fixed square shower head but been thinking what will give a decent shower but save water too. I have a instant gas water heater (26/m) and apparently some water saving shower heads wont turn on with the low pressure.

Anyone have experience with this?
If you want more pressure then you can usually just take the shower head off and there will be a tab that reduces the amount of water entering the head.