Agreed. I feel like Robert's rebellion is a more obvious choice.
If they're doing movies now I've also always thought Maegor the cruels death would make a great locked door murder mystery. All taking place int he Red Keep.
Yeah there were times where Robert came close to losing the rebellion, which provides the sort of conflict a series needs. Aegon just trucked through Westeros with very little resistance.
The obvious choice is the Blackfyre Rebellion, though. It will be tee'd up perfectly doing the Dunk and Egg stories, as those take place in the immediate aftermath and you can introduce them through that series. The cast of characters from that - Aegon IV, Bloodraven, Daemon Blackfyre (the great grandson of Daemon from HOTD), Bittersteel - provide so much meat on the bone for an incredible series. Daemon is especially a terrific character, and could easily see him becoming a fan favorite/who viewers end up rooting for.