Testing vs Design · both proven

test-driven-development vs ui-ux-pro-max

Both skills were run through Claude twice: once on a fixed brief without the skill, once with it. The briefs differ because each is written for the job the skill claims to do, so compare each skill against its own baseline, then decide which difference matters for your work. They are in different categories, so this is a choice of job, not a head-to-head on the same job.

test-driven-development

Use when implementing any feature or bugfix, before writing implementation code

Category: Testing
Source: obra/superpowers · 301,947 stars
License: MIT
Proof model: claude-opus-5-5
Brief: “Implement a function that parses a cron expression (the standard five fields) and returns the next run time after a given date, in TypeScript. Present the work as a single HTML page with two columns: the test file on the left and the implementation on the right, each in a code block, with a short note at the top on the order you did things in and anything you decided not to support.”
Skill commit: bb92a77

ui-ux-pro-max

UI/UX design intelligence for web, mobile, and desktop. This skill should be used when designing, building, reviewing, or fixing interfaces, including pages, components, design systems, accessibility, interaction, responsive layout, typography, color, charts, and stack-specific UI implementation. Searchable local data: 79 searchable styles (50 active), 192 product palettes and reasoning profiles…

Category: Design
Source: nextlevelbuilder/ui-ux-pro-max-skill · 137,486 stars
License: MIT
Proof model: claude-opus-5-5
Brief: “Build the dashboard home screen for Tally, a personal finance app: a sidebar, a header with the account switcher, a balance hero, a monthly spending chart drawn with inline SVG, a recent transactions list, budget progress cards, and an upcoming bills panel. It should feel like a finished product, with hover states and subtle motion.”
Skill commit: 56ea9cf

We don’t pick a winner for you: the pages are the evidence. Both proofs can be repeated with the brief, model and commit shown above. See alternatives to test-driven-development or alternatives to ui-ux-pro-max.