As for soil I will look at all the options
and do plenty of research. There is loads of good threads on here to look through
Your right about good threads, almost to many as far a substrate goes i think some people choose because of price, some because of brand (ADA) and some because they have really done their research. I think as long as people use EI then i'm not too sure if it matters (compaction issues are the only thing that comes to mind).
Jim