Squirt is best.
I live in the PNW and after trying everything including Pedros syn, Ice, Phil's, Maxima, Finishline wet, dry, White lightning, ProGold, Boeshield and Squirt, I have decided on Squirt by quite a margin.
Here is my theory on lubes for chains. I think the most important function is keeping grit away with actual lubrication coming second. After all, this is a human powered machine ,its not being put under any real extreme pressure, its number one enemy is dirt. It is dirt that wears the rollers, not metal on metal friction, that and corrosion. Oil, whether thick or thin does a great job at making stuff slippery, great for cables but it also acts as a transport for dirt and does absolutely nothing to prevent contamination. Wax on the other hand does. Squirt is the best wax lube as it sets up semi solid or soft and is more stable in various temps whereas others become brittle and flake off. The Squirt wax packs in the chain and stays there, lasting longer than the others while still "self cleaning" or attaching to dirt on the exterior to the point its more dirt than anything and falls off which I suppose oil does just that oil runs everywhre, not wax, which makes it much cleaner.
Squirt lasts longer than any light oil in the wet and close to many wet oils while not allowing grit inside the chain which makes the chain last a very long time. This is the most noticable improvement.
Squirt is much cleaner than any non wax lube which is huge as I hate cleaning,especially having to clean the chain to reapply new lube as most oil lubes require. Squirt only requires cleaning at the first application then you simply add it.
Progold was pretty good in dry conditions being so light but I would have to carry a bottle as it only lasted in roadie conditions.
I am interested in Dumonde Tech but really unlikely to risk leaving such a known quality product.