The position of your handlebars relative to your saddle height is the most important consideration for comfort IMO and IME. People tend to overlook this.

Really low drop bars are uncomfortable to many people who would otherwise really like them! They only need to raise them a bit.

I've seen really low flat bars/risers that are probably very uncomfortable as well.

That said, I use a slightly curved back flat bar (almost like a Noah's arc bar) on my Surly LHT as opposed to the tradition drop bar you see on most of them.