I don't think sociologists are necessarily different. If you look on the CJ faculty pages, the large majority have sociology backgrounds (especially the really well respected crim faculty who have been around for a while since CJ is relatively new). I'm actually in a sociology program now, I'm switching because sociology is a broader perspective than what I want to study and my program wasn't crime/deviance majority so there weren't many faculty members to work with. The main thing I would say is to look at the faculty, what they're studying, could you find a mentor, and is there various professors studying Criminology. If the answer is yes, then you really would be fine in either department. Hope this helps!