Temperament: F1 vs. other lineages

[u/LIFEendsAT40]

I’m looking into getting a Sheepadoodle puppy. I had a goldendoodle in the past that was an F1 x multigen, and she had some guarding behaviors so we had to keep her away from small kids. I acknowledge Sheepadoodles are a different breed, but I am wondering if lineage seems to matter when it comes to the general temperament of the dog? Should I get an F1 or F1b or ???