I warn you that this post is long and maybe you don't have time or in the right places and circumstances to read this, so I'm going to give you this sign before I start (so you're not going to sue me for this)
Hahahaha. I love it. OK now what? Oh yes.
How to determine what instrument is best for your application?
Well, It require very intense experience to do that. You know it when you have made mistakes and have a change to correct them. Only by facing the problems you can appreciate the impact of instrument selection, documentation, and installation on its serviceability.