Steps to reproduce:
1. Create a new empty project
2. Go to Window -> Package Manager and install the ProBuilder package
3. Go to Tools -> ProBuilder -> ProBuilder Window -> New Shape
4. In the Shape Tool window, select the "Sphere" shape and build
4. Create a Unity sphere by going to GameObject -> 3D Object -> Sphere
5. In the Scene view, select the Draw Mode toolbar and select Wireframe or Shaded Wireframe as the Shading Mode
6. Observe the wireframe of the two Spheres

Expected result: it would be preferable to have an option to maintain quads for ProBuilder spheres, as they are easier to work with
Actual result: ProBuilder sphere is subdivided using tris, as opposed to the Unity sphere which is subdivided using quads (and triangulated)

Reproducible with: 4.5.2 (2019.4.35f1, 2020.3.27f1), 5.0.3 (2021.2.9f1), 5.0.4 (2022.1.0b5, 2022.2.0a2)