Perhaps I've always been a lone ranger, which sometimes makes me feel lonely. I'd like to connect with cryptocurrency investors from around the world and share our insights and experiences.
I assume by mainstream coin you mean Bitcoin, however, you should have specified your question in the starting post as well because titles can be confusing sometimes. Anyway, I don't really need to make a choice between the two since I can always have both. Bitcoin will be the first choice, without a doubt, but altcoins will also get their place in my bag because I believe in diversification and there are also some altcoins that I like and that are trusted.
Ethereum is my second choice after Bitcoin when it comes to long-term investments because I believe it is the most trustable altcoin in the market, it has been around longer than every other altcoin and it has never faced any problems such as extreme crashes or anything, so that makes it a good coin.