Bill,
I have had both brands you mentioned. The Marmot got worn out around the neck and I resealed it with seam sealer. But it was really looking ratty after all those years of use so I got a new Patagonia NO2 and that has been very nice under many conditions. However at 13.7 ounces I replace it with my Frogs Toggs rain jacket if the chance of rain is extremely low. It works just fine too (and is about 7 ounces)but they are not durable and you can ruin one in just one day of bushwhacking.

For the price of seam sealer I would repair the Marmot and try it out. If nothing else, keep it as a spare in the trunk of your car.
Jim
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Jim M