In answer to the OP, yes there are differences, that help you predict, the less likely to become an issue dogs.
A solution could be a livestock guardian breed, they need stock and acreage. There are around 8 breeds, and each are different. And then within each litter even, there are differences.
Maremma's bond with their humans and stock. BOTH. But they have their favourite "friends'. Fave cow fave sheep, fave human etc
My maremmas: Social butterflies, love attention and a work break to come visit visitors in house block. They thrive on routine. Dont like changes.
It takes two years to train a pup with hours of supervised and guided practice, to not be a plonker around X breed of animal. How much time do you have?
They are nocturnal animals. So during the day, i have white bean bags in my paddocks. Not a great pet surely? But if a crow so much as dares to land in te paddock, they come alive pretty darn quick. Then turn into a whie bean bag again.
The vetinary expenses are set by the weight of the animal. So, BIG dog, big expenses.
Our herder will round anything and any kids up if loose. And does so by nipping at kids. This is what working herders do. So maybe not a kelpie, border collie, blue/red heeler, GSD, rottie.
Farm dogs are made not bred. Here are some typical successful farm dog breeds: collies, all shepherd breeds but only because they are intelligent, cattle dogs, kelpies, rotties, That i like. Plenty more also.
All need training as you know, and following you whilst you do the chores, from 8 weeks of age, is a great way to learn. Together. Praising the good behaviour, setting them up to win, not fail.
IM a bit biased on LGD's, but do love a good kelpie too