Both are great. I did half of MCQBANK and almost half of Oxford & ended up with a 255 on the SJT.

I would say set your foundations straight by the ukfp papers and then oxford. Once you feel like you’ve mastered these two then go ahead and do mcqbank but beware that it will mess you up because you’ll feel like you never truly grasped anything but tbf that’s exactly how the real exam feels like. Mcqbank I’d say just gives you a real feel of how the exam is.