Chessify is the perfect option if you want to be able to work with the strongest chess engines, have premium service, and don't like settling for the second-best.
I can confidently say that Chessify is one of the tools that revived my career after a rough patch. I use their servers every day and enjoy playing around with different setups.
Earlier I was not sure about the reliability part of cloud-based engines and had doubts whether it will be available when it is needed most in the middle of tournaments; but after using it for a few tournaments, I have concluded that it is reliable.