Trueflip also is a blockchain lottery. How are you going to attract people to your project?
True flip draw results are taken from the Bitcoin blocks hashes, that's the only blockchain feature true flip has.
The funds are stored on private addresses with admin access, the tickets are sold on internal true flip platform, the prize payout and dividend payments are manual.
In SmartBillions case, the whole process is managed by 1 smart contract. There's only 1 address for the whole operations. The funds are under smart contract management, the lottery draws and all tickets are public and held on Ethereum blockchain.
SmartBillions is a self-amending smart contract where all the rules are transparent and unchangeable.
Thats what i find the greatest about this project.