Staking Rewards - What coins give the best ROI stakingwise?

[Crypto Piece]

Im thinking about what coins give a good ROI when staking them in the wallet for a while. A friend of mine said he owns these coins:

6000 ARK (18.000 USD invest) give you about 1,5 ARK a day = 45 ARK a month with 3 USD per ARK = 135 USD/month

--> Only need to have them in wallet and staking, no running computer required.

200 NEO (15.000 USD invest) give you about 1,5 GAS a month with 25 USD per GAS =37,5 USD/month

--> Only need to have them in wallet and staking, no running computer required.

100.000 Unify (7.000 USD invest) gives you about 20 Unify a day = 600 Unify per month with Unify being 6 Cents = 36 USD/month

So to me it seems ARK is a great coin just to put in your wallet and stake, but maybe there are even better coins out there? Anyone can tell me other good staking coins? Thanks

[Crasengover]

Though 135 USD per month is not bad, but If I had $18k I would definitely use them in some other ways. The best way to increase your portfolio is to invest in ICOs. In the best scenario, you'll get up to x5 from your investment. All you need is just to find a good ICO, which is not a difficult task, when you know where to look for.