Sakimoto has come a long way, imo. His earlier works don't seem to amaze me, but everything after Vagrant Story has been quite good.
His music DOES have emotion when played by an actual orchestra. I believe that he needs to move out of synthesized music and go either into full orchestra or a mixture of synth and performed. His Opening and Ending themes for FFXII and his Staff Roll for Vagrant Story are all evidence that his music can be melodic and emotional. I find his intricacies the most amusing, as he has such a unique view of orchestration, and I'd say that's pretty good for someone who hasn't been formally taught how to orchestrate music

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His music has always fit the atmosphere of the games he writes for, and in Final Fantasy XII he wrote music that worked for both battle and field themes. He is quite good at what he does.
Mizuta is the most disappointing and bland composer I've ever heard of in VGM, imo. There are some pieces of his that are good, but that's a small handful compared to the junk he calls music.
Sakimoto has this guy beat in EVERYTHING, and Mizuta won't ever get anywhere close to him.
Jam it back in, in the dark.