Sorry to answer your question indirectly.
For my case use, I would buy a WM MegaLite and a Nemo Tensor all Season size WM or LG
Even better would be WM AstraLite and the same mat as above
Reason- I camp between 25F and 50F range low temp, Can always supplement with a thin CCF foam pad under the Nemo to add only 4oz if camping on snow or frozen ground. I prefer a wider bag or quilt and can wear Alpha or Down upper layer in the sleeping bag if I get cold at night. I will never sleeping on a 20″ wide mat ever again, needs to be minimum 25″ wide. Thermarest NeoAir are not bad, I just prefer the baffles and shape of the Nemo, (rectangle vs mummy).