Turcoman have attack -1 and def +2, that makes 1 in melee. With valour bonus from Anatolia, it`s 0 att and 3 def, makes 3 melee, Futuwwas have only 2 in melee and lower armor and no province with bonus. Futuwwas will kill enemies quicker in melee (especially charging) but will also die much faster. With the valour bonus, (especially if you have +v from master bowyer too) Turcoman can put up a fight against some lighter inf or spearmen. I use them as quick task force, if I need some inf at a hot spot. When the enemy tries to kill them, flank them with the Futuwwas.