I still have an eye on IOTA since months, but I am too much into Byteball. It definitely makes more since to hold all my btc (or even buy more) and get free byteballs, than sell a little bit and buy IOTA instead.
But I think, when the Byteball giveaway ends, there can be a little switch over to IOTA. And that will be the point where I maybe start to invest a little bit.
Is there a date for the ending of the giveaway?
It depends on the amount of linked BTC, which is growing rapidly in the last rounds. I think last distribution round will be in October.
BTW: With 1 BTC you get around 30 to 70 $ worth of GBYTE. So a 1-3% dividend per month. With the current volatility of BTC this is not a good reason to wait three months till buying IOTA.