What’s everyone’s favorite book scanning app?

It seems like everybody is using scout IQ I’m currently on the free trial. I don’t really see what it does differently than Scoutly. Scoutly is cheaper too! I feel like everybody uses scout IQ because that’s believed to be what the professionals use. I also think people believe that, due to the fact scout IQ is sponsored by nearly every bookseller. Is there something I’m missing? They both have downloadable databases, keepa charts, triggers and eBay/Amazon integration.