Hi Greg,
This is a matter of personal preference. Yes, the cars are enhanced each year, but I personally prefer having one from the first year of production, in this case, a '63. There's something special about one from the first year with the initial specs, etc., a 2020 living example of the original 230SL debuted in Geneva in '63. Also, some of the interior chrome work on the 230SLs, to me, is nicer than the 280SLs, such the ignition key housing; I also prefer the bolder 230SL steering wheel and horn ring over the later ones.
Cheers.
Cole