The LX90 is one of Meade's more reliable products - a well known scope which is likely to perform well out of the box. The LX80 is built to a lower price point and could easily be less reliable. Meade also charges more for the ACF vs standard SC optics.
Later this year Skywatcher is releasing an alt/az version of the EQ6 mount which is going to be more expensive than the LX80 but likely more reliable too.
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