hiver77, I use desert archers as front-line skirmishers, and Ottomans as the second line archers. I would stay out of Turcomans (rabble-like formation, bad morale, abysmal attack) for sure. Futtuwas are decent, but slighlty unreliable (impetuous and low on defense, like ghazi with bows). I generally go with Ottomans alone, as they are decent, disciplined, and can even plug holes in the line if the need requires it, unlike most other archers, and therefore can be useful even when they are out of ammo. They have decent defense (for a missile unit), and after the patch their armour-piercing capabilities should be more pronounced.
And you might want to have Janissary archers instead of J. infantry if you're fighting in the desert due to their lower armour, apart from that, I don't see that they can be superior in any other situation.