The braided line does look nice so if thats what your after then go for it. In the original post you made it sound like you were considering it just because you didnt have the tools to do hardline.
Assomeone already mentioned, it can be a pain if you dont get a clean cut. It will be hell to get the fitting together and blood will shoot from your fingertips.
As far as the angle goes....I think he probably means like if you match a 45* AN fitting to a 37* JIC or something like that. Im sure that to use braided line, you would have to get the correct adaptors both at the radiator (which I believe is just pipe thread) and at the transmission to make everything male AN.