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Stake United. The rewards have been incredible so far - so much better than the masternodes I've been running on my own vps's.
The only issue is the trust factor. Rather than controlling your wallet, you have to trust this site which has control of your wallets. That said, they have a discord, they've been very responsive, and folks like myself have been using it for a while and have had no problems whatsoever, including withdrawal.
They take a 3% cut of the stake, which keeps them in business and keeps them incentivized to NOT run off with your coins, as that would destroy their steady stream of passive income for a one-time gain.
Even with the 3%, it's been better than solo masternodes for me due to the sheer number of people in the staking pool which exponentially increases the rewards.
Highly recommended.