I’m no expert on which one to get etc. but you do know ESB and ROTJ helmets are different, right..? Check out 501st’s CRL on Vaders to see some of the differences.
In my opinion the ROTJ mask is the one I prefer because it's the first time you see the mask from the inside and showing us the real Vader and a glimpse of the suffering Anikan has endured on his journey to becoming the villan we all know.

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