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I don't use both. My ST-i has worked fine but has a few hot pixels. Fortunately it has a shutter so can do darks quite easily and the hot pix become a non-issue. I don't believe the Lodestar has a shutter. Consequently there are some programs that will not be able to use a dark frame with the Lodestar - specifically TheSkyX Camera Add-On. It will try to take a dark automatically unless turned off. I do think the lodestar is quite sensitive. I don't know if more sensitive than the ST-i, however.
I think you would be fine with either camera, but the shutter on the ST-i is quite nice.
Peter
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