What are the best tools for tracking display ad performance?

I want to start a discussion focused on tools that make it easy to track display ad performance, clear dashboards, flexible attribution, and cross-channel reporting. While some lean enterprise, several have features and integrations that make sense for learner teams too. (Referencing G2’s Display Advertising category.)

These are some of the top-rated options on G2’s Display Advertising category:

• StackAdapt: Known for accessible, multi-channel programmatic with robust in-platform reporting (custom reports, campaign dashboards, frequency capping, optimization). Is it simple enough to standardize KPIs across teams without exporting to BI?
• The Trade Desk: Enterprise DSP with deep measurement—exposure logs, flexible reporting feeds/APIs, and a broad partner ecosystem to tie spend to outcomes. Does its reporting granularity make week-over-week optimization faster for you?
• Simpli.fi: Popular with agencies and multi-location brands; offers granular bidding, optimization, and reporting, plus integrations for automated client reporting. For local campaigns, do its dashboards surface enough detail to act daily?

If you’ve implemented any of these (or others), I’d love to hear what worked well, what didn’t, and which dashboards or metrics (reach, frequency, view-through, assisted conversions) were most helpful for day-to-day optimization.