Good question :)

It's the same method, staking.. holding the coins in your wallet.

The problem from what i have seen with staking.. its more chance rather than a set % of interest.

These networks have huge amounts of coins staking.. and someone new who comes in with only a small amount of coins has virtually no chance of receiving a reward.

Both reddcoin and diamond coin have similar issues.

After speaking with the coin developers of diamond coin i understand they will shortly be releasing a new version of DMD which will share out the rewards more fairly, based on the percentages.

There will also be master nodes available with 10,000 DMD if i remember correct, and i am told the rewards for hosting a master node will be around 10 DMD per day which is around $60 per day.

I like diamond coin because there are only 4.2 million coins.. reddcoin has 28 billion or so, although i also really like reddcoin too don't get me wrong i am holding some of that too ;)