Installing a A9LH hack and a CFW is always better, as you can play all kind of modified games from any region and you don't have to press a button like a tool. Also it is free.
I don't find the Sky3DS practical or useful at all, I would prefer to carry my original game cards and switch them.
In the other hand, using CFW is really comfortable with your games in your home and also the many possibilities of modding, of course IMHO.
Regarding bricking, you won't brick if you can read English and know how to follow the steps of a recipe.
It is slow and cumbersome to do, but you shouldn't brick if you read.
I don't find the Sky3DS practical or useful at all, I would prefer to carry my original game cards and switch them.
In the other hand, using CFW is really comfortable with your games in your home and also the many possibilities of modding, of course IMHO.
Regarding bricking, you won't brick if you can read English and know how to follow the steps of a recipe.
It is slow and cumbersome to do, but you shouldn't brick if you read.