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One advantage is that you will get double the aperture, so you will get to see deeper and have higher resolution.
For an equatorial mount I wouldn't suggest anything less than an Eq3. An Eq1/2 will lead you to nothing but frustration, especially if you have even moderate expectations of seeing deep sky objects. I have 3 equatorial mounts and have helped many budding amateur astronomers who have bought these mounts. They are more trouble than they are worth. Especially at that price. If they were for sale at half the price I would say, maybe think about it. Eq3/4 is the smallest I have and I would consider it the minimum for an 80mm scope for moderately frustration free imaging.
Dobsonian may not look like a "professional" but bang for the buck you can't beat them.
And I don't have a dobsonian. I like photography. You will get very frustrated using and Eq1/2 for imaging.
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