All helmets came from the same mold. The dents were added later and some helmets, like ESB, have some additional warping. Possibly from heat, possibly from adding the dent, or who knows. So they are all basically the same in that regard. On screen you have ROTJ and ESB helmets. Off screen you have a few more. The onscreen difference is paint job and physical damage. So it's mostly just personal preference and budget for which to get.
ESB:
If you want a mass-produced the EFX is the best in that category. It's an ESB replica. There are no mass-produced ROTJ.
If you want a fan cast if you can get your hands on a Machinecraft Replica's ESB or RS Prop Masters helmet they are hands down the best ESB cast. They are a Gen 2 cast of the real helmet. Then paint job wise
superjedi does the best ESB paint ups. Otherwise there are plenty of FPH2/3 based helmets and MR based helmets out there.
ROTJ:
There are no lineage ROTJ helmets but there are quite a lot of fan sculpts or lineage casts from other helmets that have been modded to ROTJ. Personally I like animefan (on the RPF) helmets. They are super strong and based on the Masters Replica helmet which is a cast of the PP3 helmet.
Paint wise I've always been a fan of Famous Fett paint ups. I also do ROTJ paintups that I'm quite proud of.
Production Helmet History:
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Helmet History including casts:
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