The best ones of those are the Syndra ones and the Oriana ones [Due to how things are currently coded, champion specific minions are functions of the team rather than an individual]
Oriana only has one ball, each Ori just repositions the new one. So if one ult hits, every ult hits
Syndra all share balls, and all create new independent balls. So when one Syndra ults she ults with all the balls