Best demand side platforms (DSP) - what's your top pick for 2025?

I am working on choosing a new DSP for my small business. I’m hoping that this community can help me nail down a final choice from my working list. My price range is fairly flexible, and I have a timeline of 3-6 months. 

StackAdapt: StackAdapt is a multi-channel advertising platform specializing in native, display, video, connected TV, audio, in-game, and digital out-of-home (DOOH) ads. It is recognized for its user-friendly interface and robust targeting capabilities, making it suitable for small to mid-sized businesses seeking to optimize their advertising strategies.

The Trade Desk: The Trade Desk offers a self-service, cloud-based platform that enables ad buyers to create, manage, optimize, and measure advertising campaigns across various formats and devices. It is known for its advanced data management capabilities and comprehensive reporting tools, catering to advertisers aiming for precise audience targeting.

Simpli.fi: Simpli.fi provides a range of advertising solutions, including display, mobile, video, and social advertising. It is particularly noted for its localized programmatic advertising capabilities, allowing businesses to precisely target audiences based on geographic and behavioral data.

Basis: Basis is a comprehensive platform that streamlines digital media campaigns by integrating planning, buying, and analytics. It supports various ad formats and channels and offers automation features that enhance marketing teams' efficiency and performance.

Quantcast Platform: Quantcast Platform leverages AI-driven insights to facilitate effective audience targeting and campaign optimization. It provides real-time data analytics, enabling advertisers to make informed decisions and improve the effectiveness of their programmatic advertising efforts.

My gut says StackAdapt or Basis...what do you think? Any first-hand experience or stories would help build my confidence.