Depends on the rod and what you want to do...
Rio Gold is a great all around taper, but it is also .5 line weight heavy. So a Gold 5 weight is really a 5.5 weight.
If you want a true-to-weight line for a softer rod, Rio Lightline or Scientific Anglers Trout taper are both fantastic.
I prefer Rio products but have some Scientific Anglers as well. Keep whatever line clean, free of chemicals and it'll last a good while.
+1.
Couldn't have said any of it better.
MM
