I like Scandi grinds because it is easy for me to maintain the angle and sharpen them in the field. Typically, I use a diamond sharpener in credit card size.

When at home, I like the simplicity of a Spyderco Sharpmaker. Quick and easy...

However, I convex my axes and machetes using sandpaper and a mouse pad. Since this is not diffcult and creates a sturdy edge, I have recently begun to convex some knife blades also. After the initial pain of getting them in the right shape, I can pretty much maintain them using a strop.