I made this exact switch a while ago and don’t regret it at all. I find the deluge much more intuitive, playable, and logical than the Pyramid was for me. With the Pyramid, which I owned twice, I always felt like my ideas would hit some sort of software limitation or interface I couldn’t really figure out, it never worked like I wanted it to. The Deluge is the opposite, generally things work like I expect and feels “natural”, with a couple exceptions that I had to learn.
However, the Pyramid definitely has more sequencer features in some areas. So it will really depend what you use it for … for example, the Deluge has no really concept of time signatures, just track lengths. You can write each track in whatever time sig you want, but it doesn’t have any helpers for it. It also doesn’t have the type of midi effects that the pyramid does (it does have an arpeggiator), and the song structuring is not as detailed. If you love the Pyramid’s micro editing and super detailed control over every parameter then that might be a thing you’d miss with the Deluge.
However, I find the Deluge a joy to play and I have yet to run into anything I want to do that it can’t… One of the major benefits of the Deluge sequencer opposed to the Pyramid is that the Deluge has no artificial track limits… you could have any number of tracks you want until the processor hits its limit. And the grid style sequencing and keyboard are fantastic.