We can argue that holding has a better risk/benefit ratio, but the growing rate of holding is 0. Buying a certain amount each month (for example) and holding ... is not really growing, is just buying more, as I see it.
But if by growing is meant "using your Bitcoins to get more bitcoins" it will always mean some risk.
This is true, but even if you use some risk on Bitcoin, you can lose as well, sometimes the best is dollar cost average (buy monthly and never, never slack on buying useless shit, always save the amount for Bitcoin).
I dont trust any alt now to gamble with my Bitcoins to make more Bitcoins.