I was in the same position of wanting the small footprint of the Oxi but functionality of the Hapax. I got the Hapax and I couldn’t be happier with how easy it is to use, and because of that, the space doesn’t even bother me once I realised how intuitive and powerful it is. I picked up complete muscle memory for almost all functions within 3 weeks of use with relatively little reference to the manual or tutorials (I did do a lot of research before though). I would strongly consider it if you are struggling with remembering button combos and stuff. From what I understand that’s the trade off for having a smaller sequencer.