It's true Sociology won't be quite as "good" a degree as Law at face value, but i'm doing a sociology degree and i absolutely love it. if you aren't a detail oriented/factual person you'd probably enjoy sociology far more, as law contains all sorts of dates and bills that you have to remember, whilst sociology has a manageable amount of that type of thing. it's like studying life, and so relevant to your own life, it's brilliant. the opportunity is there to be creative with the subject too, and i often enjoy exams because i can argue my personal opinion, even if it is unconventional, and still get a good mark.
If you're intending to do a masters, it really doesn't matter which you go for. i'm intending to do a masters in marketing/business to go into advertising. It's also true that having law on your CV will be an automatic "i am smart and i can work very hard" to employers, but i think that advantage is overstated (especially by those who have law degrees). all degrees require a lot of hard work.
all i'd say is don't listen to those who say sociology degrees mean nothing, because their strength is that they are very flexible (plus work experience placements are the most important thing after you have a degree), but at the same time don't listen to those who say "just pick the degree you want to do" because law degrees may give you that little boost you need to get a particular job, particularly if you aren't doing a masters.