I have a little experience with soc versus psych. I loved sociology... after intro. Intro was a beast with a boring statistician who you could barely hear touting family systems and who knows what else... However, I eventually took several other sociology classes, loved them, and aced them...
How did they apply to my MSW?
Well, it helped w/systems theory... but otherwise, that's about it. I went to a clinical MSW program which is heavily applied and teaching us to work within the system of pathology laid out in the DSM. You will not ever learn about the DSM in sociology unless it's in a crim just forensic class.
I wouldn't say you would be at a disadvantage without the psych background but I will say that students in my program from other fields (and we only had 4 total I think, English, BSW, film, and vocal music) did end up putting in a lot more time/effort to understand the material.
No offense to the BSW, but I would think you'd have a higher GPA coming out of a BSW than a psych. Then again, my psych program was one of the top so maybe that explains its rigor. Compared to my MSW classes, it was a trillion times harder. My social work classes were 85% fluff and busy work. The real meat of my degree came in the field placement.
Classes: genograms, autobiographies, and diversity articles
Field placement: real world clinical stuff
I don't really see there would be more application of theory in the socio major. Mostly, in my soc classes, we did analysis of studies and presented them in class. There wasn't even any real undergrad research available in the sociology department at my school. At my first undergrad, they actually ended up doing away with the sociology degree/department completely.
In my psych program, I completed 2 semesters of clinical counseling practicums. Also, there were research opportunities galore. Most classes had some practice or lab element built in.
I guess, in the end, however, it will all depend on your undergrad institution and the actual programs you are deciding between.
For the record, I also have a degree in elem edu... by choice, I went way over and have 162 undergrad credit hours. I loaded up every semester b/c I was concerned that I wouldn't know my psych if I didn't take 30 different psych classes. Truth, in the real world, no one else took that many... and I probably would have been ok without taking that many.
For me, the only time I really learned at a level where competency started to kick in was when I was in the field everyday... so, I guess my class choice didn't matter too much at all other than opening the door to being in the field.
Confused? Me too. I'm exhausted. PM me if you have any other questions. I don't check here often anymore so the only way I know if someone wants to talk is via a pm. Be well.