I believe that Uniswap's "UNI" token will perform best by the end of the year. That's largely because Uniswap is extremely popular within the "De-Fi" space. It's so much better than using traditional decentralized exchanges such as EtherDelta or IDEX built on the ETH blockchain. Anyone can swap any ERC-20 token with ease using Uniswap. Considering that it's been the pioneer of a decentralized swap platform, it has gained first-mover advantage on the market. The "UNI" token could reach new heights in price within such a short amount of time. The "De-Fi" hype will take quite some time before everything goes back to normal. You can expect not only "UNI" but other "De-Fi" tokens like "LINK" and "COMP" to rise towards unprecedented levels in price quickly because of the "De-Fi" craze. But ultimately, the level of usability of a project will determine an specific token's price on the market.

In the end, we may never know which "De-Fi" tokens will become relevant in the crypto/Blockchain industry for a long time. Crypto is still unpredictable. Today, "UNI" is on the headlines. But tomorrow, it could be another token or coin. Remember, "De-Fi" is not about profits but rather about bringing "Banking to the Unbanked". As long as "De-Fi" remains useful for the world, it'll be here to stay for many generations. Just my thoughts