Fixed-wing ASW aircraft or a common helicopter fleet?

Would it be better to operate carrier-borne anti-submarine aircraft alongside helicopters?

Both are desirable, but a force limited to one anti-submarine aircraft type gains flexibility from helicopters that can use escort decks as well as carriers.

Carrier-borne anti-submarine aircraft are desirable alongside helicopters. If logistics can sustain only one type, helicopters have the advantage of operating from escorts as well as carriers. That commonality gives the same aircraft access to both kinds of flight deck. Carrying special forces is another reason offered for retaining crewed helicopters.