If you're trying the find the perfect setup, then you won't. Some days you'll be feeling sluggish and wish the the bars were higher.
If your uncomfortable on the bike in the first place, go to a shop to get you set up. They'll make sure that your saddle / pedal position is right first before even thinking about the handlebars. Once that is right, you might find that you need a shorter or longer stem anyway
If your uncomfortable on the bike in the first place, go to a shop to get you set up. They'll make sure that your saddle / pedal position is right first before even thinking about the handlebars. Once that is right, you might find that you need a shorter or longer stem anyway