well, if you are willing to take huge risks with high potential rewards, then altcoin "trading" will give you the better returns. but i personally consider "investing" btc into altcoins to be the same as gambling. that's why i left altcoins in 2014 and focus solely on trading bitcoin against the us dollar. you'll need more patience with bitcoin, but i don't mind it as i know i invest in something with a great future potential.
Good proper suggestion . I agree with this , well I do two types of trading ,
1. Buy large amount of small priced coins like dogecoin . ( ex . buy at 35 sats and sell all when it touches 37 or 38 sats ) . It will take maximum of 3 to 4 days but you gotto do some analysis like seeing the chart , what was the price before 3 days , all that
2. Buy btc , keep it , be patient for 5 to 6 months and then sell to make 50-60$ .
So basically I do both , altcoin trading and btc/fiat . As randy mentioned , high risk is involved in altcoin trading but you will get high profits for sure.