All three are reputable. Generally SGC is known for grading a lot of pre-1930s cards, but it's really personal preference. Beckett hasn't graded nearly as many vintage cards but they're growing in that area.
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PSA; short for Professional Sports Authenticator was Founded in 1991. PSA was the first widely accepted grading service and set the standard for the graded card market. PSA graded cards are sonically sealed inside a protective, tamper-evident PSA holder with a tagged label that shows its certification number, manufacturer, grade, date, unique bar code and player's name. This label appears above the card that is graded. To get complete information on their card grading standards, visit their website.