that would be entirely up to you.
I would suggest you need a certain amount of basic electronic skills to do a hard mod ( personally soldering irons and me do not get on very well)
I think a hard mod would be more stable but you cant make a mistake 1st time round.
I think I would be right in saying a soft mod would be less stable but if you do it right it will work fine.
Mine is a 4.2e soft mod and works great with wii ware and a usb loader.