honestly i dont totally understand about ziliqa but if compared with ADA which is show impressive performance in this year, personally i am prefer Cardano as my investment portofolio. Cardano was strong coin in crypto market now and also they will launched smart contract platform which is most waited by community. this smart contract hopefully could compete with another platform that easly exist in crypto market.
Zilliqa doesn't have any news that can make it big in the crypto space, so if we take the percentage between Zilliqa and Cardano, there are still more people who choose Cardano at this time, because they know more about Cardano through the news and developments of Cardano that are notified by the Cardano community.
what did Cardano do before the update they announced recently?
Cardano also has the same problem. not so much project development. what happened was just a movement created out of community hype.
but beyond that, ZIL and ADA are worth investing in long term. We can see this from the trade-off between the two assets