I also think new coins with smaller market cap are best to invest, especially privacy coins. I don't recommend investing all your portfolio into 1 single coin because it is too risky when it comes to investing in a new project. I've checked out the project you mentioned in your post and they seems good and legit to me and investing 10% of your portfolio into these coins could pay off in the long-term.
Personally, I think it is much more dangerous to invest in new projects, it is better to invest in top coins because they are more predictable and safer to invest.
Predication will be never guaranteed in both of top 100 coins and new projects. You can go for new coins of short term, New projects will definitely bigger risk. Big profit seekers looking in the new coins. I didnt trade new coins when these project is listed a few day before.