In my view Bitcoin, Ethereum, Ripple (XRP), Litecoin, Bitcoin Cash are the
top crypto in 2020.
You're most likely right about those since they're the biggest ones on coinmarketcap, and it would take a lot for some other coin to bump any of these coins from their positions...except maybe for ripple, which I hate with a passion. I'm *hoping* it falls in its ranking, but it's a long shot.
We're going to have to see what happens to the crypto market in general next year. If bitcoin gets moving forward in price, its going to make a lot of other coins very attractive. I would add dash and xmr to the above list, tho I don't like naming coins I think are going to do well because it sounds like shilling. I have some dash but no xmr, but privacy coins might be the big thing next year.