Long term - Bitcoin and Ethereum. Both are perfect assets.
Short term - altcoins like Ripple, Cardano and IOTA that are good for trading and buying something.
Yes thats the best combination of short and long term investment, but theres other people that they have their own idea about long and short term, but me thats the best way of investing or hold.
I also agree with you Btc and etherium really considered as a long term because they already proven something that deffinitely has a good feedback to someone who already tried it for a long period of time.