Coin choice will matter even in long run if you consider the price of it in fiat. Imagine you are winning the investment at Yolodice but you are losing the price of your coin in fiat, so in the end, it will ended-up breakeven or a loss.
Good explanation, therefore if I have to invest, I would choose bitcoin as it's the most stable coin in the market now.
I've seen altcoins which falls even 50% or more of its value in just a short period because of FUD, so that factor can also be considered when investing.
Not saying bitcoin could not fall at that rate too, it's possible, but the difference is that bitcoin is the most dominant coin in the market, if it falls it will certainly recovers as there's a lot of interest at stake from investors in this coin.