Your best bet is to stick with the Dex Cool as most of the problems associated with that coolant have other causes. Poor gasket materials and designs, poor maintenance, air infiltration into the cooling system can all cause the problems people like to blame on Dex Cool. A properly maintained system will give you the best performance, which includes thoroughly flushing the cooling system out (which is true for any coolant used,) and changing the coolant on a 2 to 3 year (or 30,000 to 40,000 mile) schedule instead of the 5 yr/150,000 mile schedule once suggested. many of the defective designed gaskets have been re-issued with better materials and workmanship as well.
The Dex Cool is the recommended coolant by the automaker to work in conjunction with all of the various components and materials that make up your engine. I have, and have had many GM vehicles that use Dex Cool and really haven't had any issues,and still continue to use it,(and recommend it.)
As long as the coolant is properly maintained and air is kept out of the system, it should be trouble free.
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