I do believe the met are far superior to the initial investigators who targeted the parents due to their failure to understand the canine and forensic evidence
I totally agree. Also the fact that SY detectives will not be adversely affected by the many culture differences - some of which IMO caused the PJ to be unnecessarily suspicious of the McCanns..
It seems clear to me that UK police officers and some PJ officers of Amaral's 'generation' (the old school) have very different attitudes and understandings as to what constitutes legitimate proof/ evidence. For instance a 'dream' would never be regarded by SY detectives as a reason to change the whole direction of a case imo.
IMO both the differences in culture and the language barrier worked against the McCanns throughout their time in Portugal.
SY are in the superior position of not being in danger of being wrongly influenced or sidetracked by a lack of understanding caused by cultural differences.
AIMHO