Hello there,
I just completed my LCC Master's with BPP, and I would recommend that you go for the PGDL. The UK legal industry is becoming more competitive by the hour, and a PDGL is very openly appreciated in firms.
This is because these courses are not similar to your undergraduate law studies. They involve practical work, learning elements of advocacy, drafting and other key skills that would set you apart in applications.
I would suggest BPP for your SQE course, not just because of the career guarantee but also because almost 90 per cent of my cohort have successfully passed their SQE1. Your LLB will already help you fare better than others with this course, and BPP has a PGDL with SQE1 course as well, so you don't have to choose one or the other.
Hope that helps,
Upama