I always thought that was kind of ridiculous. There is nothing about big and clunky that makes it easier to grip a hilt. Whoever came up with that never used a sword(I haven't either, but I used to practice kendo, which is similar). The OT hilts were made as they were because they looked cool(and could be made cheaply). No more, no less.
That said, I prefer prequel sabers over OT from a strict aesthetic sense. EU is a mixed bag since it covers different eras. From more recent comics, I like the Old Republic sabers, but not so much the twisted turds that the Sith use in Legacy.
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