Hey quecola!
I did Legal Studies, but didn't do Revs (despite having many friends who did), so take my opinion for a grain of salt as I'm probably slightly biased towards Legal!
I loved Legal, and the content from 1&2 was VERY similar in Unit 3, and somewhat different in Unit 4. I'd say if you like the more analytical side of things, and want to do *better* utilising your 1&2 knowledge, then I'd go for that. The common downside I hear people complaining about with Legal is that it's 'boring', or that it is a great amount of content. In terms of content, I'd agree, it is a lot. However, as long as you go over all the theory you're pretty much set for SACs and Exams.
Revs is a little bit tougher. Legal requires a quick hand to write, but Revs is next level. Probably a little more memory-based, and you need to be a better writer through writing essays mainly, which isn't a skill you have to deal with in Legal.
Where do you feel your strengths lie?