It depends on your mining equipment and the money you have to invest in mining. bitcoin mining can be profitable but it need high quality mining rigs and lots of electricity. most of time the electricity cast of bitcoin mining will be more expensive than how much you mining from your miners. so small mining rig not good for bitcoin minings.
if you have small capital then use it to altcoin mining.
I would recommend you to mine Lisk, Etherium and Waves, these are three most high potential altcoins at this moment.