IME:
OEM - Great. Spark blow-out at above 19psi on a 30r though.
Taylor - Horrible. Spark blow-out at wastegate pressure on a T-25.
NGK - Mildly better than Taylor.
Ultra - Best plug EVAR. Don't know what it was about these, but overboosting to 25~26psi before spark blow-out. Any less than 25psi and zero blow-out.
All of the above on stock internal coil B14 dizzy setup, and all with BKR7E's, same gap.