It ultimately depends on their personality rather than their badges. There are plenty of stories of yukkuri with horrible personality with high ranked badge or vice versa.
Pretty Much but because Bronze is usually considered "just the average Yu made a pet with no real training or anything" it becomes as much of a gamble as "will this wild or stray yu be nice and not a shithead demmanding me things because "yukkuri" ?"
While higher level badges in theory assure some greater chances of a nice yu, it's far from absolute or perfect since loophole abuse, corruption, bad training, bad exams, etc. can let shit yu's slip by.
Well you could argue Yukkuris by default are a gamble, an annoying and stressful gamble that kinda isn't worth it, so we should be thankful they don't exist to add just another layer of stress and annoyance to our daily lives.
Moral of the Story, be grateful asshole wizards don't exist or else yukkuris, yukkuris everywhere ruining everything and then getting ruined!