Just consider what you need and like and what your workflow is or shall become…
I got the OXI one because:
- it’s a matrix sequencer, quick access to many functions and visiblity of notes and parameters directly step by step
- it supports CV
- it’s also a “keyboard” including “chord-mode”
- great editing features, also quick to handle
That’s not saying anything negative about Elektron sequencers. I have a couple of them and love them. Some functionality of the Elektrons could have been inspiration for the OXI designers 
Both are very complex but capable as well. I would say, both are overkill for what you seek or both are not 
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