First of all, these three projects have completed ICO crowd-funding.
Second,Zil may be better off if you look at the outlook, but it has gone up too much.
If you want a bigger return, I suggest you look for undervalued tokens.
I've never heard of Zilliqa and just looked it up. But it sounds like it's pretty popular so far. I checked and it's currently at number 28 in coinmarketcap.
But do you think it will go up? I mean what you said that Zilliqa might be better off, but it has gone up too much? But shouldn't that be the more important thing. It would mean that it's more stable and less risky.