An actor currently takes up about 1016 bytes while an object takes up about 56 bytes. At least on this version with this compiler/os but that should give you an indication of the intended uses. And what you use very much depends on the goal and what your willing to sacrifice. If it’s just a basic game that’s not pushing mechanical limits and isn’t multiplayer then using actors for everything won’t likely hinder you even if it’s not ideal. I recommend reading the documentation and looking at the header files for these two classes if you really need to know, and see what kind of data they hold. Their cpp names are AActor and UObject.
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