I think Dash will reach $1000 by year end
That's quite an unfair comparison... Ethereum has a circulating supply that's more than 10 times as high as Dash's.
That means that when Ethereum reaches $100 and both Ethereum & Dash have the same market cap, Dash would be worth more than $1000. Why? Because that's how the world works.
I believe Dash could easily make it to $1000. Ethereum probably too, but a bit harder. In my eyes,
Ethereum is mainly used for ICO purposes. I predict a pretty stable Ethereum price, so no $300 -> $1000 before the end of the year.
I'm not a Dash expert, but I believe that Dash has a far better chance of reaching $1000 by January 2018 than Ethereum. However, Ethereum's market cap will stay far above Dash's.
Summary: Dash