This is a very interesting topic!
Until now I do not think staking is very productive!
In my case at least. With a small budget your stakings will be very low.
Rigth now I have:
Bannercoin (BANC) - From an airdrop, i generate something like 0.01% in one month
Waves - It's LPoS. Leasing for 3 months and the profits are minimum! I think I can generate more by going once a day to a faucet
Stratis - I decided not to remove my stratis from exchange to stake because I will take some time to recover the transaction fee
Lisk - It's DPoS. I think this could be the more lucrative that I own, but the lisk spended in voting for delegates will take some time to recover because delegates have minimum payouts.
In conclusion, my experience with PoS its not lucrative