The H22A will be faster for the reasons stated above. The H23A may have slightly more torque, but it will probably be very hard to notice (the displacement difference is far smaller than say that of a B16A vs B18C). The H23A will be much cheaper and easier to locate however.
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Andy - Reinstated
Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.