i would take the 8" dob over the eq mounted celestron. EQ mounts are great for tracking objects in the sky over long distances with precision for astrophotography. unfortunately to do this you need something with motor drives and something quite a bit more sturdier. so getting this kind of mount means you get all of the headaches (time taken to align to the pole) and none of the benefits (better tracking and location of objects) of EQ mounts. you are better to get a Dob with much better light gathering and resolution. if you are looking for casual observation with a 6 year old, i think that the EQ mount will be a little frustrating and will be relegated to the closet very quickly.
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