I will own one soon enough.
For my purposes, I couldn't get an Ozonic even if I did like it better; 61 keys is a bare minimum for a controller personally, and it's going on the second tier above an 88-key stage piano anyway.
If the Ozonic does what you want, go for it. But try both. Decide what action you like better, and if the preference is with the X-Station, whether the difference in feel is worth the cost to you. Decide if it's worth the extra cost at all to you having the scaled-down (but still great sounding, depending if you like that sort of smooth subtractive style) Novation KS synthesizer in the controller. Keep in mind that the 37-key Ozonic is about the same price as a 25-key X-Station and the 49-key X-Station is about $150 more.