I have had long term good experience with the Evercoat products.
They have many versions of fillers for different needs.
Their lite weight version is easy to work with and is a "non clogging" variety.
Great for routine dents and dings.
I have also used their heavy duty fiberglass reinforced "waterproof"
product with great success in leveling & filling in hopelessly wrinkled
body panels. These repairs have held up for 12 years with no shrinking or flaking.
In my experience the cheaper "bondo" type products tend to pop and blister at some point.
my 2 cents
mike