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From what I've read, having a matched blood type is of little or no importance for a full transplant because the recipient's old immune system is eliminated or vastly weakened by radiation and/or chemo so it can't attack new blood cells of another type, while blood cells produced by the old immune system are being replaced anyway. However, a blood type match might have a slight advantage if all other facts are equal.
Matching a donor and recipient depends much more on HLA matches. HLA matches are more common within your same ethnic background but otherwise race does not matter.
A female donor who has had pregnancies is a second choice to one who has not been pregnant or to a male donor, other things being equal.
For a CMV negative recipient, a CMV negative donor is better. A CMV positive recipient can have either a CMV positive or CMV negative donor.
Family members are preferred to unrelated donors with an equal measured match, since other (unmeasured) factors may also match.
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