Hey Gillian,
I've only used Kaplans study text cause i like the font size and make of the text book plus it's easy to understand and work with. My friend uses BPP only for questions cause they seem to have a variety of tough questions. Most lecturers recommend both, stating that both are pretty good and helpful. Personally I find the Kaplan study text easier to understand and the bpp exam kit good for question practice! Hope this helped.
Tried Kaplan and BPP, but my love is Becker-they are cheaper and easier to work with. And i don‘t know if it is coincidence, but i always pass with them)