- when you put multiple creatives in the same ad set, the system has more data to compare CTR, CVR, engagement level, etc. from there, it automatically distributes more to the most effective model
- if you split the creative into many ad sets, the data is fragmented, each sd set has few impressions, machine learning is difficult to optimize. Concentrating into 1 ad set helps the amount of data to be more stable, the learning phase will be faster and more stable
- meta has officially advised advertisers to reduce the number of campaigns/ad sets and focus on "creative testing in the same ad set. This goes along with features such as dynamic creative and advantage+ placements/campaigns