its depends on which one you like the most and easy to get some bits BTC from this two way. Investment more to profitable in a long term,i believe. Can slowly save yours bit BTC. But, if you really want to gamble, make sure u are ready to take the situation where you will be faced with lose time. Coz,its about a luck matter. If you got a great luck,then you win. If not, you gonna lose it all. Thats just my opinion, and for sure i rather gamble than invest coz i love to gamble.