Forget the labels. A good toy for a baby has a few key qualities: it matches their developmental stage (not too easy, not too hard), it allows for active exploration (baby does something, something happens), and it doesn't replace the parent's role in play (the toy doesn't do all the entertaining).
By this standard, a cardboard box is an excellent toy for a 9-month-old — they can put things in it, take them out, push it, sit in it, bang on it. A flashy electronic activity center that plays a song when you push a button? It's fine occasionally, but it does the work for the baby rather than letting the baby do the work themselves.
The research from Trawick-Smith et al. (2015) found that the toys rated highest for play quality in early childhood settings were simple: basic blocks, play dough, and toy vehicles. The lowest-rated were complex, multi-feature electronic toys. The simplicity allowed for more creative, sustained engagement.