In my opinion, if you're in it for the profits, just go with what gives you bigger profit percentage increase. If you're doing fine with the alts, then why change your strategy? What I would suggest is to probably do it 50-50 though. Every week, go $50 on bitcoin and the another $50 on some alts that you believe has value in the future. Why invest straight in to BTC if you can reach the 1 BTC goal faster by investing in alts?