Which one should I go for, if it’s the GoPro – which one ? I don’t want to pay above £200.

The Sony seems to get good reviews and is £129.00

GoPro

Ive got a GO Pro back edition for sale brand new with used chest strap for £200

Sony has fantastic image stabilisation, and I think is a better camera than the GoPro (certainly at your price point). Only downside for me is the form factor, which is a bit awkward when chest mounted.

As a Sony owner I would agree with colournoise on the form factor. There is also a bit of ‘iPod effect’ with the GoPro in that third party vendors make their mounts to fit a GoPro, and anything else is just an afterthought.

I’ve got the sony. You can flip the recording 180 degrees so it makes chest mounting easier. I bought a go pro mount adapter which screws into the tripod mount so all go pro mounts fit. Fitting it to a gimbal on a quadcopter is more of a pain.