DCK was more boring and blank than even nitrous in my opinion, a complete waste of time for me personally. Others around me often found it somewhat comparable to normal ket though. When I mixed DCK and ket, I found it just "flattened" the magic/psychedelia of ket.Maybe it was the dose, but I found DCK to be pretty bland and the most boring of the ACHs I've done.
2F-DCK however I found to be significantly more "magical"/psychedelic, especially when combined with ketamine. The most I'd ever used was ~200mg of 2F-DCK alongside ~300mg of ketamine within the span of maybe 3 hours all together. I would prefer 2F-DCK (or moreso 2-FXE/2F-O-PCE/"CanKet") compared to ketamine any day of the week, I've just found it tends to be more difficult to find and pricier than ket, often costing twice as much or even more than ketamine for some tragic reason.
2F-DCK on its own feels like a genuine trip, whereas ketamine only does if I'm in the right headspace and use an adequately large amount. Combining 2F-DCK (as well as 2-FXE) with traditional psychs felt more like mixing two psychs, I mixed it with 2C-B, DOM, LSD, miprocin, allylescaline, 25C-NBOMe, 25I-NBOMe and 25B-NBOH. Every time it was amazing, but in those mixes, I could've replaced it with a higher dose of ketamine relative to 2F-DCK/2-FXE and it would've been indistinguishably similar imo. DCK I found so boring that I only mixed it with LSD, 2C-B, DOM and miprocin, and found all of them to almost feel flattened or more boring in a way similar to having mixed large amounts of benzos with those psychedelics.