Ask HN: Web Dev Agency owners – what do you look for in SaaS tools?

I recently acquired a form backend service (Kwes Forms) and noticed many of our customers are web agencies who use us across multiple client projects. I'm trying to understand what matters most to agencies when choosing tools. Beyond the basics (reliable, great product & support etc), I'm not sure what would make the most sense to further target additional agencies given the organic niche.

For those running agencies or working closely with them:

1. How important is white labeling? Does it need to be perfect or is basic rebranding enough?

2. What pricing models work best for you? (per-project, unlimited client usage, etc.)

3. What features are critical when you're using a tool across multiple client projects?

Would appreciate any insights on what makes a tool "agency friendly" from your experience.