In fact, I lost around 10 coins on an old mobile that I threw away.
Gaaaaaaaahhhhhhh!!!I'd have a hard time getting over this I think. As far as altcoins go, I like DOGE and I have no rationale for it other than I like not having to use fractions and also the quick confirmation time. I don't do any mining as I'm not into crypto that seriously. But it's pretty much just bitcoin for me.