Modern collectors ?

When collecting modern cards who do you go with PSA or BGS? Why do you go with them? I wanted to start collecting Ovechkin cards because he is my sons favorite player and it would be fun to collect with my son. I see a lot more graded by BGS on ebay. Are BGS graded cards more popular with the modern collector? Thank you in advance for any help.
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looking for 1964 topps baseball psa graded 7+