I just received my Swinging 60's sub back from PSA (18 months later) and would have to say the grades were much lower than expected. I feel if I would have submitted to SGC the grades would have been better, but just basing that off of past experiences as until this submission had only used SGC. At the time though PSA was offering $9 a card compared to $30 at SGC. I will continue to alternate between the 2, as I currently have a sub at both companies right now and preparing 1 for each as I write this.
So for me I am on the fence, if SGC came back down in price and had a basic registry (a way to organize my collection) I would probably switch back to them exclusively.

We have one nearing completion as well.

I've always preferred the SGC aesthetically and feel like they are a more consistent grader. With that being said, I have far more PSA cards in my collection because I've always bought more graded cards than I've actually submitted myself; and there are just way more PSA cards on the market.
I have a stack of PSA cards I'd love to cross to SGC now but at the current price of $30 per card I just can't do it.

Harder grading is neither consistent or better.