Times, they are a-changing.
1999-2006 or so, PSA was best, most accurate.
2006-2011, SGC surpassed them for consistency, as PSA was overwhelmed with volume, suffered incredible grader turnover and began pursuit of screw-the-customer policy of half-grades.
2011-present, no one deserves the honor, IMHO.
Beckett?? Please! Dr. Jim should've stuck to price guides.
#1 in 1959 Topps