I bought all 10 GS and 5 BR...I'm regretting that I only bought 5 BR ..should have bought all 7 of them.
GS's PS is more Calculation oriented where BR's PS is mostly according to passage and thinking I guess like real MCAT!
BR also has great Bio/orgo passages... Definitely harder than GS and AAMC according to my personal experience!
GOOD LUCK! (VR = F*** it)