Never tried Fromm. We've fed our toy poodles Natural Balance Ultra small bites for 10 or so years now. The 3 years before that when we got our oldest, we fed him Nutro duck and sweet potato and briefly switched to chicken and sweetpotato and that was when we discovered he had a mild allergic reaction to chicken and we went to Natural Balance and never had any problems.
We lost our oldest back in December to kidney failure but our 10 year old is still firing on all cylinders.
We just got a new toy poodle puppy about 2 months ago and for whatever reason, I can't find the natural balance we have been using anywhere and don't want to pay 60 bucks for a bag so we're going to be mixing the rest of our current bag with a 5lb bag of the Nutro Essentials small bites. 1 week in and zero problems.
The one thing I have gathered over the years is that every dog food review site you start looking on will have it's fair share of people in the comments bashing whatever brand or type food you're looking at. Made their dog sick, hospitalized the dog, killed the dog, you name it. Every food you research will have someone claiming it killed or made their dog deathly ill.
Dogs are different just like us and what makes one dog sick will make another dog healthy and normal their entire life.
I've consulted with the vets we've used as well as people who work in the pet stores (most I've talked to have zero allegiance to any specific brand and genuinely just want your dog to have the best even if they don't carry it) as well as breeders. The woman we bought our new pup from made her own food from stuff she gets at her local butcher/grocery since it was cheaper than buying pallettes of the stuff from the stores.