for trading - alternative altcoins, because i think will be max profit. For holding - bitcoin or etherium.The choice is yours. Good luck
It will depends on market you can earn also max profit in bitcoin trading in just a week for me holding altcoins is more profitable especially those coins have promising roadmaps.
altcoin will be greatly benefited when you know that the price will go up. usually it is marked with acceptance of an altcoin in the new market. sometimes, it makes the price increase. honestly, i prefer to predict altcoin than bitcoin.