First I would not pay to grade anything right now unless it is for the purpose of trading or selling. So if this is stuff that is not going into your PC then my thoughts are as follows:
I prefer the SGC holder. The fast turnaround time is a plus too but I just cannot consider SGC right now for higher grade vintage material from any era. Both PSA and SGC are being tough but much easier selling an under graded PSA card.
If it is mid grade to lower grade material I would go with SGC.
I agree with Snowman however. The merits of the card and how PSA versus SGC will interpret it will have a huge influence on where the card goes. One other thing to consider is if the card being submitted is one that would appeal to set registry collectors than you have to go with PSA.
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