I have WG Uber, TSR and FG. I have yet to crack the lid on Uber or FG as I am removed quite a bit of defects with the following setup:
Machine - Flex 3401
Speed - 5 then 4 and light pressure for the final section pass
Polish - WG TSR
Pad - Lake Country Hybrid White Polishing Pad
The TSR and white pad remove defects well and finished great. I went straight to the LSP.
Its idea to have all three so you can try the least aggressive method that will allow you to achieve the best results.
For full disclosure, the vehicle I worked on with TSR and went straight to my LSP, it was a daily driver and the owner wasn't willing to pay for a two step, however she was blown away with the results.
Edit: I also performed a test spot first to ensure my pad, product and technique would work and it did. If I was not happy with the results, I would have moved to another test spot area and used Uber with the orange Hybrid pad.