This comparison is judged on one job: building a secure client portal with logins, role-based access, and per-user data visibility. That job exposes a real split between v0 and Softr because v0 is fundamentally a code generator for React interfaces, while Softr is a managed app platform with authentication, permissions, and data connections built into the product surface.
A portal is where nice-looking generation stops being enough. The failure modes that matter are not whether a card layout looks polished, but whether access rules hold, whether edits create a costly fix loop, and whether the person shipping the app can maintain the security-critical plumbing after the first demo.