The answer is, whatever feels best…
It really depends on the shower, some have a hard setting where just the middle bits jet out, and sometimes that even had a little ball that spins in it and makes it vibrate. That’s the jackpot.
Some showers you need to let fall a long way to get it powerful enough, others will be strong enough close to you. Others will be too strong, in which case you can even use it under water.
One of the key things you can change is keeping your clit covered, when you let the water hit it, or pulling back your clit hood and letting the water hit it directly, is much more intense.
For more bath time fun, you can try this:
http://female-orgasm-denial.tumblr.com/post/118527468193/edging-task-fun-in-the-bath-if-youre-lucky