I just got both of these today, and to be honest, the ROTS Anakin is far better. Why? The hilt is not as oversized as the luke one for starters. Im ok with the oversized hilt, it enables the sound etc to be present, however, i do like the slimmer style of the ROTS hilt.
Also i just think the Anakin one looks alot more metallic. It has a high gloss finish, in comparison to lukes brushed aluminum look.
But if sound is your kicker, the Luke saber does sound better, and the LED is a bit brighter on it.
Happy decision making!