If you are going to use bookmap for U.S. Equities, you will need Dxfeed, as it provides data for Bookmap.
Now for your actual bookmap subscription, there is Global and Global+ - If you want to trade with IB within Bookmap, then you need Global+. I trade inside of DAS, so I don't need it. Otherwise, the features of global+: Iceberg detector does not work with Dxfeed, I feel like large lot tracker is "meh"... and and the order book imbalance would be nice IF Dxfeed could supply the NYSE/ARCA book, but Dxfeed can't, which means any NYSE/ARCA orders are missing from Bookmap which there are a lot of which makes me think that an orderbook imbalance feature wouldn't be accurate anyway as a result.
For the time being, I'm just using standard global on Bookmap - For equities, Global+ does not seem to be worth. it.