[CQ-Contest] Best callsign letters

[John Geiger]

Has anyone done a study (or have ancetodal evidence) about which letters (using standard phonetics) get through best on SSB during pileups or marginal/weak conditions?  For example, I though "j" would be decent letter but many people seem to hear "Juliet" as "India".  Don't know why they make that confusion, but they do.  So, which letters are best recognized and less confused?

73s John AA5JG