Massimo Neri for me. Pat Rice is the only one on that list that I've had as an assistant, but his advice has been pretty poor to be fair. It's weird as I've heard people talking about how amazing he is. But Neri is my first team coach and has been amazing. He will be promoted to assistant in the summer when I get rid of Rice.
In an assistant manager i look for ; Judging potential,Judging ability and motivating.The 3guys I use the most ot ouf the options have to be : Tony Coton,Valter Di Salvo,Al Stewart and Terry Mcdermott.It was tough but in the end i decided Di salvo(legend)