I use different waders, also the G4 Zip and Rio
Gallegos Zip. The G4 is the first for many years in use, the Rio
Gallegos is the third one (bought two and got one replacement after leaking in very short time).
The G4 is a “Panzer” compared to the Rio
Gallegos, both, in weight and durability. The breathability of the G4/GoreTex is much better, compared to the Patagonia, although the G4 is thicker in material. My last Patagonia is a backup now.
Of course you will get different answers. And of course any product can fail. In fact a brand new G3 failed from the beginning after one I had for ten years.
But asked which one I would prefer, Rio
Gallegos or Simms Freestone, I would take the Freestone without any doubt.
I use the Freestone as a hip wader for a longer time now. It was meant to be a warm weather and low water option. In fact I use it very often now. It’s really well made and one can see the quality. It made around 150 fishing days now without leaking. My Patagonia’s made 40-50 days.
Breathability of the Freestone suffers, compared to the G4 or G3 GoreTex waders. In this aspect it’s comparable to the Patagonia or any other wader, using not GoreTex.
There was a model change for the Freestone this year. Mine, which I am referring to, is the former model, two years old. Check the fit. At least mine is very different to the G3 and G4. I had to go down one size.
Good luck !