I have big singles as replacements for original soapbars in a Sadowsky Metro 5. I am deeply impressed - punchy, organic, and surprisingly hum-free (probably a function of superior grounding and shielding, per Sadowsky and my very talented local tech). Sadowsky himself has said that he liked the Big Single the best of the three you mention, and he continues to offer the Big Single as an option. Great pickups! But I am a Nordstrand fan, based also on use of their P/J and single J pickups in other contexts over the years.
WWJD...What Would Jamerson Do?