I've got both a GoPro 11 and a (series of) Insta360 One X2. They both have their issues but are nice to have. I'd suggest that your mounting method might determine which one you get, but here are my observations.
I like both for the ability to derig, get the footage uploading and have it on my phone when I get home. Insta software is better.
The Insta360 works great with a harness mount. I made a simple one by epoxying a 1/4-20 stud into a carbon tube and socketing it into 3d printed mount that I matched to the shape of my harness using Fusion 360 canvas tool. I put a piece of kiteline inside the tube to act as a safety line, haven't needed it yet.
For the Gopro 11 I just use a stick on helmet mount.
I prefer the harness mount and Insta for the images as you can do a lot more fault finding as you can see your entire body, rig and board. It's also really nice for capturing other sailors or the occasional insane fishing boat. The image quality is not as good as the Gopro.
The big issue with the Insta360 one x (and 3 and 4, the 5 is supposedly better) is that it's not completely waterproof. I've had 2 go bad and they always say it's water intrusion, even though on the second one I've been taping over the doors to try and keep it dry. First time it was replaced under warranty after a TON of arguing. Second one they replaced but charged me $110US for "repair" I know another sailor around here has had some issues with his but likes it as well.
Having both, the insta makes for a more useful training and cool pic tool,. but in my experience it's not the most reliable. I would really love if someone else came out with one that's completely waterproof. Supposedly the onex5 is more water proof, but I haven't heard from anyone who's shelled out us$550 for one yet.
They're all cool, hope you enjoy what you get.