Engine wise there is no difference in the two bikes, hence same for the thump.
Classic has a look of a "Bullet" where as thunderbird is thunderbird. both are equally comfy to ride.
what you feel apealing is what is imporant.
i would suggest, dont go for thunderbird just because you are getting it earlier...its not this or that...you are buying a RE bike, wait and get what you always wanted to.
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