I also prefer the Parlophone Blue Box. I have a number of the later Beatles on MFSL and initially they sound quite impressive. However I found that "the mix" seemed to differ a fair bit from the Parlophone set. The MFSL dynamics in particular are fairly spectacular and the bass and lower registers are a little too overpowering----great if you want to hear Ringo! Its almost like the engineer was "riding" the gain Also the vocals were noticeably different in not a pleasant way. A colleague of mine brought over original Parlophone (France) stereo LP's and these were unbelievably good. The good news is that the Blue Box Parlophone set was close---tonally very similar just not as resolute.
I would look for a good copy of the Beatles Blue Box.
I would look for a good copy of the Beatles Blue Box.