I better trade altcoins to buy bitcoin because bitcoin is more expensive that altcoins so i prefer to trade altcoins and buy bitcoin then i will hold it for a long period.
I think it's not worth because the Bitcoin price is stable from last few months but the altcoins prices are varying. if you do correct calculations you can make a profit by doing bitcoin to altcoins trading. my recent trade is i bought 0.01 BTC IOSTokens and within 1 week i sold it for 0.02 BTC.