I have some question to the forum, actually, one of my friends ask me to use my account for asking this: "Which is the Best Coins to invest for a long terms?" I got confused to answer

, Of course I gave some advise, my opinion, but still probably some of Professionals Collectors/Dealers on the Forum could give her better advise?
Which coins are best to invest? silvers, golds, proofs, coopers? If person not collector, and doesn't care what "color" of coin, but want to save some money as investment. Which types grows up faster in many years?
That's all she needs to know.
Kind of confused question, but still a question.
thanks a lot.