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Rising Star is the best. I have not played Splinterland yet so I can't review it.

Rising Star doesn't demand you to be smart or compete with anyone to earn money. You don't need to spend time on it except during your early levels where you will be playing shorter missions of 5 mins and 10 mins.
The game is just like mining. You just click on mission and go away to whatever you are doing before. When the countdown finishes, you earn Starbits and then play another mission. There is nothing like loss here since you ain't competing.

You can play as a free user but your earning will be low. So, you just need to throw in some funds to get energy boost that can allow you play all the time , and have average number of fans which increases your earning.

If you have any other questions, feel free to ask.

Thank you :)