Great combination, however, it does require a lot of setup and Indepth knowledge of Midi and Audio to get it working. (Plus, I don't think the other half would allow it in the lounge)

Don't forget you need a pedalboard to get the best from an organ.

If you don't want to add the Wersi 76 note semi weighted lower manual (The OAX1 just drops on top and looks like it is one), you can get an 88 note Midi Piano keyboard and use this instead. (Again, this would allow the ability to have the keyboards closer together (You don't have to leave a gap to see the screen or buttons as there are none) making playing easier.

When playing organ most of the style parts are turned off (Sometimes only the drums are used) as fancy styles just get in the way of your playing, plus a Yamaha style convertor is a low-cost Activation (Option) that will allow you to use all your Yamaha styles directly in the OAX1. (Also, as it uses the Wersi designed sounds, it all sounds cohesive rather than as if something has been tagged on)

Sound wise, whatever you want, there is a VST out there that will provide it.

You only have one screen and set of buttons to worry about when playing.

Which is better for you, only you can decide, that's the beauty of having flexible options.

Bill