I will go a little way off topic too, but I think nobody can discuss that in general terms, the later examples are better than the first examples of a given motorcycle. During the production life, the manufacturers modify their original design, either to fix teething problems, or to appeal to the tastes of the day. After 30 years, tastes change and maybe you rather have one of the models that were considered ugly in the day. When it comes to technology, later models are obviously advanced with regard to first models, and when in many cases the power output is reduced, in general it is done to make the motorcycle more reliable, thus increasing its life and reducing warranty claims.
That's what happened with CB350's. The engine was pretty much unchanged, but the camshaft was modified to reduce peak power as people was riding them hard. After the CB750 was out, the styling changed to make the twin look like a younger sibling of the superbike. Probably, early models command a higher price today, but the later models are suppoused to be the most developed.