I don’t think the CAD you use really matters that much. Just chose one (Onshape, Solidworks, Inventor, Fusion, Solid Edge, (Protobot, Protobot Rebuilt)). They’re good enough.
(New Team Starting Resources - VEX V5 General Discussion - VEX Forum)
Only other CAD for V5RC I know of is Protobot Rebuilt.
Best CAD for Chromebook/Browser: Onshape (generally said to be better than Protobot and Protobot Rebuilt)
Blender isn’t really a dedicated CAD software
TinkerCAD is more for 3D printing