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They're two very different cameras.
The ASI1600 has a larger sensor, larger pixels and lower read noise but having a little bit lower QE.
What this means is that you'll have to take significantly longer exposures with the ASI183 as you will the ASI1600. As you're only using an 80mm telescope you probably don't want to be trying to resolve down to its Dawes limit (it's ability to resolve) so I think you'd be better off with the ASI1600 personally.
The microlens issue that people (myself included) have experienced tends to happen more so with larger faster optics than an 80mm F/6. It'll be there on brighter stars but it won't be as intrusive as a bigger and optically faster telescope.
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