I vote others as the key word is "monster canister filter"
I have all Eheim C/F running on my tanks now which I love but the biggest I have is the 2260 no monster C/F at 3500 lph.
My vote goes to OASE Filtoclear 15000 at 10,000 lph.
I am fitting one to my new 400gal tank for all the mechanical filtering and a sump for the bio.
The best thing about it is its very easily cleaned just back flush when doing a water change and pull the handle at the same time which squashes the foam up in side the filter and rinses it clean.
OASE German quality
cya
Rat