This is gonna be a novel.
Remember before we get started, the transition from series1 to series 2 was 95 for the NA and 96 for the SC.
Series 1 NA is the L27, Series 2 is L36. All superchared, whether series 1 or 2 were known as the L67.
With any SC model, you take the worry out of the plastic parts. With forced induction, you open up a world of possibilities for future performance for a little better price. Depends on how much you intend to spend. The L36 can get pretty hot with the right work.
The valve sequence on the L27 and older L67 is different than the L36 and newer L67'*. As such, there are no heads or intakes available for these engines (and because the valve sequence is different, the cams are too). That'* a major difference. All of these engines really are different animals. Swapping from any one to another is a bear. Wiring harness, pcm, trans, all have to go.
What it all boils down to is what exactly you want to do to it, and personal preference.
If you go L67, go 94 or 95. The SC'* were ported out larger and run at a lower RPM. Same boost, but less wear and tear.