system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Which lightsaber does Luke prefer to use?

Luke's had two lighsabers over the years: the blue one built by Anakin, and the green one he made himself to replace it. They're slightly different in length and the grips are very different from each other, so I assume that they each have a unique "feel" to them in a fight. I understand that there's probably a sentimental connection to the blue one, but the green one was built by Luke for Luke, so there's got to be an attachment there as well. 

Legends stuff is ok, since there obviously isn't a scene in the movies where Luke outright states his preference.
gpt
Luke's saber is built just for him, no one else, it's an extension of himself. A lightsaber is made by the Padawan for a reason, so they have the connection to it and put a portion of themselves into it in the form of their Force.

Anakin's lightsaber is blood stained and filled with hatred. Luke couldn't feel it as a young one but a certain force sensitive did.