PSA/DNA has been around a lot longer and have two excellent top authenticators in Bill Corcoran and Kevin Keating.
Of course, Beckett has former PSA/DNA lead authenticator Steve Grad and others so either company is respected.
JSA is also considered reliable as Jimmy Spence Jr. was the first lead authenticator for PSA/DNA before opening his own authentication company 15 or so years ago.
Really just a question of choice. Any of them are competent. My guess is PSA/DNA may take the most time to authenticate due to volume but I certainly do not know that for sure.
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