muddyknees2000 said:

It adds to the character, shows that he's becoming his own person...foreshadowing that he will not follow in his father's footsteps. Just adds more depth, instead of him just copying his father's lightsaber again

Very true. Still, you could go the complete opposite direction, as I did in my red saber idea (in another thread), you could create subliminal suspense by having Luke have a lightsaber like his father. This could create fear that Luke will be exactly like his father and the audience gets far more relieved when he decides not to be.