Dash is by far the biggest gainer in the entire ecosystem. While BTC gets a lot of press simply due to it/s massive individual price, Dash has been gaining on it all year. So far BTC has gained 1700%. While Dash has gone up 8770% since January 1st. Ethereum is just behind it.

 Actually, I just calculated and Ethereum gains have gone over 10,000%. So Ethereum is in the lead. But the year is not over. Let's see on December 31 who has posted the biggest gains by %.