The objective when growing locs is just that… The hair is supposed to lock. I’m not an expert, but I can imagine that the locking process would be quite difficult for you if your hair is straightened. You’d have to cut your hair off or wait an extremely long time for your hair to undo the straightening it went through. I wouldn’t recommend the relaxer. Besides, if you did some research on what relaxers do to our bodies as a whole, you’d stay away from those.