That is quite a common statement but if you cut open different brands of the same oil filter fitment there are often big differences. I've done this with Landrover filters. Rover V8,2.5NA,200/300tdi run an ERR3340 as original equip. I've fitted a Britpart one a couple of times and found the oil light pressure light lingered, took them off immediately. They clearly have a weeker bypass in them. No issues with Mann or Mahle. When you cut them open the internals can look very different even down to the point cheaper ones have half as many pleats in the material.
Sadly you can't even rely on a brand name these days.
Crosland used to be quite a big name but the rights to that name were bought by Euro Car Parts as far as I'm aware.
Often you will find you can use a shorter or longer filter that is exactly the same dimensions other than length. It's surprising where crossovers are. One that I've seen at first hand, Rover V8 uses filter will exactly the same specs a early Volvo T5 other than length
I only buy decent brand filters, Mahle,Mann,Bosch. I can fully understand avoiding a manufacturers offering and using possibly an OEM filter but I don't see the point of saving £2-3 on a filter and buying super cheap when the reality is for many people that will only make £5-6 difference over a year. I change the oil every 4-5k in our cars and change the filters every other time. I'm still well within the service intervals at 8-10K and on my daily driver that 4-5 oil changes a year.
If you are sticking with what a vehicle tells you then I think it's more important to buy decent quality because some cars won't need an oil change for 15-20k