Love them both. Poggle the Lesser and the Geonosians are among my favorite seperatists (underneath Wat Tambor) and I loved the culture we could see in these battles.
The first Battle of Geonosis started The Clone Wars so it’s obviously very important and generally just a great battle. The second battle was alright I guess. My favorite part about it was probably Ahsoka and Barriss’ friendship.
Both done well. First battle shows the inexperience & lack of preparation on both sides as they just throw everything they have at each other head on. Second battle shows how they've progressed & the tactical skills each have learned for conducting a planetwide campaign.