A key aspect of answering this question is to look at it as part of a new system not the way things are done now. Is it better to just pay people and let them decide what to productively do with their time?

Well if they’ve been educated in a way that fosters creativity and initiative, yes . If they are just going to degenerate into tv watching alcoholics, because they have had the personal agency trained out of them already, no.

UBI must be a part of a comprehensive system that sees all people as having intrinsic value, and sees education as being to help develop that natural capacity. Then people benefit their society because they get to, not because they have to.