You would make to a greater extent a higher rate purchasing a bigger number of Waves than purchasing 3 ETH. Waves will probably triple or even 10X, where as ETH may just twofold, best case scenario this year. Simply my supposition. In case you're searching for a short to medium term money out I would recommend waves. ETH is strong however and improbable to lose its hold as one of the best 5 coins. Waves is great long haul hodl as well as it won't just ascent in cost yet in addition pays something like a profit for holding.