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I've never used an AIO until recently. I've always done a one step polish, then applied sealant/wax (on my own vehicles). The AIO I was recommended is Chemical Guys AIO. I've used it a couple times and really did a great job removing swirls and light scratches. It brought back a great gloss and wiped off easy. I'm planning to try 166 and HDS, this is just what I went with first and like it so far.
I'm guessing you're talking about Chemical Guys V4, which I've used, along with D166 and Speed. In my experience, D166 cut better and gave me better gloss than V4. Speed's cut was about the same, but the slickness and gloss were much better. If longevity is more important to you, McKees 360 is tough to beat as AIO's go.