I don't think that altcoins will give more profit than bitcoin or vice versa, because I believe that your income/profit will always depend on your trading style. I guess, day trading is more effective in Bitcoin than altcoins due to its potential growth in the market in a short period of time, and for long-term investments I think altcoins is the best for that because you can hoard coins for a very cheap price like Stellar, Ripple and other coins that is below 5$ which may give fortune to our lives.