I have an 8 inch LX-90 and a friend has a 10 inch LX-90. The ten inch is significantly larger and heavier - if carrying difficulty is a prime consideration, I'd go for the 8 inch scope. The LX-200 8 inch is significantly heavier than the LX-90 8 inch as well.
If you're not committed to astrophotography, I'd also suggest you save your pennies on buying the 8 inch LX-90, rather than the LX-200, and put your money towards eyepieces. I describe astrophotography to people as "standing under a cold shower tearing up $100 bills!"
DT
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