Igor was the better scorer for sure, shooting 74% from the FT line and 60% from 2. He was also the better playmaker, having the best assist rate after ZZ among regular rotation players.
Carey is the better offensive rebounder, though, by a good margin. He also gets to the FT line better and is generally more comfortable playing through heavy contact in the paint. He brings an element there that we didn't have.
But Estrella, who you didn't mention, is the wild card at that position. At his ceiling he might be able to shoot like Igor (he shot 71% from both the FT line and the floor his freshman year), while also being comfortable in contact like Carey (while also being 3 inches taller than Carey). His floor, on the other hand, is "injured; did not play." Anything at all in between is probably still on the table until we see more from him.