For ESL’s and Planer speakers, because they are fast, you need fast sub woofer/s.
"Generally" I would go with smaller 8’-10" rather than larger 12"-15" diameter, as smaller ones that are designed right, should in theory be faster and able to keep up with ESL/Planer type speakers better, also ones that have motional feedback circuits would be good to look at. Isobaric’ed ones are also fast, but are rare, and expensive.
There’s nothing worse than a sub that’s slow and can’t keep up with the mains
Cheers George