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I'm using the Google shopping app for my shopping feed.
Would I be better off using a different app, such as Simprosys etc? If so can I ask why?
Every app has its benefits and negatives. Only with experimentation will you find the best apps.
It also depends on your budget, the better apps are more costly. And the cheaper apps lack features.
I recommend you first write down all the features you want and need, then check which apps can fulfill these requirements, then choose one. Also check the reviews of the app you are using.