The 2.2 does have a wide dispersion that makes them ideal for on/off axis, but it's also about 7-8dB less efficient at 86dB vs 93-94dB so you will need to boost them a fair bit to match the output of the Otica.
The larger X-Voce and X-CS models are more efficient at 90dB, but their off-axis performance isn't as good, due to the higher crossover between the tweeter & mid-woofers.
The mid range of the X-Voce will be more similar to the NX-Otica as they are also open-baffle.
If Efficiency/tone matching is more important then I would go with the X-Voce.
If Off-axis performance is more important, then I would go with the 2.2.