you could say 2017 is the best, because the bounty goes so well and the payments are always on time, even faster or if it is only a few days late. In addition, price growth in the market is also significant, from the bottom consistently to the top and the peak at the end of 2017 before finally falling in 2018.
2017 is the prime year of crypto, where its momentum is really impressive and undeniably high. The market at the time is less risky as we can earn even there are tons of shitcoins, the popularity of airdrop and bounty. After that year scam projects appear, so lucky those who able to take too much profit from the 2017 hype.