If its for a Novice Id recommend a DDPT Mg. Stilleto seems to be the highest Dagger they can wield. Though you can confirm whether they can hold Gladius by readings the description on any gladius. Just use any gladius to test it . I am telling this on the basis that a Pro SN asked me to forge elemental Stilletoes rather then lvl 3 stuff . As it is I have my doubts Novices can equip lvl 3 weapons without soul links(Super Novices)
if you cant equip Gladii, Id say go for MG so that you can double attack with a SN and share the dagger with a Sin char as well as be able to resell it in the future.