Fence post holes

[JimM169]

Following on from an earlier post, what's the best tool for digging holes for fence posts. Need to go down a couple of feet in sandy\gravel type soil


Do I go with a corkscrew affair

https://tinyurl.com/ybxepwej

a narrow spade

https://tinyurl.com/y87avexd

or the double hinged spade

https://tinyurl.com/yad3mooj

Thanks

[JimM169]

It's 8' x 100mm x 100mm wooden posts with closeboard 6' x 6' panels

Only 11 posts but liking the idea of a petrol machine - £160 on Amazon and sell it on after?

https://tinyurl.com/ychtrjbx