Insurance will be more in GA ($700 p,a extra for me personally) due to having to have extra public liability coverage. Medicals, I’ve never gotten out of cheaper than $400-600 every 2 x years. Usually have to join SAAA to get the plane registered with any form of help. To do maintenance in GA you’ll need to do the MPC course for about $550. You’ll prob need an English launguage assessment too for GA. Inspections for first licensing in GA were more than RAA but I was lucky there for my first build.
If I didn’t want to do aerobatics I wouldn’t even consider GA,,,, it’s just way too hard. Building in RAA was significantly easier for me.
If you do build in RAA though be sure to make sure everything is correct.
SAAA will help you with all your documents, flight manuals, maintenance plans and lots of other things, I could go on. Your very much on your own in RAA I’ve found in my area is all I can’t comment on.
You need to talk to someone in person that has done both. If you have a supportive RAA school go with him,,,,