Are you into trading? What coins do you like to trade the most and what's your trading startegy?
Most likely ETH and BTC. My trading strategy is not that complicated. Sometimes, I'm using the advantage on the difference of price between two market such as BTC and ETH to arbitrage. However this is difficult to spot on since most of the time their strength against one altcoin pair is same.
I also like to trade with bitcoin and ETH because of them are good and having huge potential to rise in price, when you will decide to buy then now you will not have to spend so much money but you will be able to buy at low price, later on after long term trading you can trade with huge amount of profit so my choice is bitcoin for trading.