I have had a Galaxi for ~ 2-1/2 years. Turned a couple hundred bowls/HF's with it. The only problem I've had was with the remote - worked for a little while then stopped. Nova doesn't sell it anymore, I suspect sales were too low to put forth the resources to fix the issues. Fit and finish is on par with similarly sized/priced lathes - they all need burrs knocked off and a little tweaking here and there.
I'm 99.9% sure the motors are the same for the 2 lathes. Other than swing/length differences, the most significant difference is the Galaxi HS pivots and slides, whereas the Orion only pivots. This could be an issue hollowing deep bowls/vessels as there is limited travel for the outrigger tool rest. With the Galaxi I have slid the HS down the bed a few inches to make room for some deeper vessels. I think you have to get to 8-10 inch depth or more before it is an issue.
As mentioned, I have and use the outrigger. The pivot HS and bolt on outrigger is why I chose the Galaxi, and both features work very well. IMO you want a bolt on outrigger that moves the toolrest with the lathe vs a floor mount where the lathe can "orbit around" and the toolrest is still. To my knowledge Nova still DOES NOT have the outrigger for the Orion available, and I would not buy that lathe without the outrigger.
While the DVR motor is not why I chose the lathe, it is a very nice setup. The 8 pre set speeds is an excellent feature. I much prefer the speed control setup vs a potentiometer, but then I like knowing what the rpm's are while others don't care. Not sure why the Aussie had trouble coring. I can core all day with mine and not come anywhere close to stalling it. I use a Woodcut Bowlsaver with 2 knives, largest core ~12". I run the lathe on 120v. Yes I can stall it, but I have to try. If I bury a side ground 5/8" bowl gouge into a chunk of wood it will stall, but it's a much heavier cut than I normally take. Large out of balance blanks with interrupted cuts can be a bit problematic. At speeds below ~300 rpm with significant imbalance (which is why the speed is slow), things are moving around and it can be difficult to control the cut size. The motor control attempts to control speed/torque, and torque is changing rapidly due to interrupted cuts. Sometimes it starts "hunting", and torque is jumping up and down, and the motor will just shut down. Typically the hmi says "low voltage", then resets itself. Hit start and you are off and running again, and unless you change something in this situation, it may happen again. It's actually a pretty good protection mechanism. Over 300 rpm it rarely happens - The control gets more samples, the imbalance is getting less, cuts are better, and things smooth out. With a balance piece and smooth cuts, low rpm operation is fine. Which brings me to the "auto detection" feature of the control. The idea is the control senses a catch or other anomaly and shuts down to prevent injury/damage, and I think it has 3 levels. I tried it on the least sensitive setting and it would shut down constantly. It's just too sensitive.
I purchased the lathe through Tools Plus online. I had never seen or touched one prior to buying. Like others, I love the pivoting HS concept, and IMO Nova did a good job on the Galaxi. It can do anything a fixed or sliding HS can do. I have just about maxed it out between centers, length and diameter, without issue. As mentioned I core bowls, do up to 15" dia x 12" deep hollow forms without issue.