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difference is FoV
go grab yourself a 3m long tube. you will notice that theres less light and a greater effect of zooming in then go and grab your 1 meter long pipe and youll notice theres a bit more light and a wider view.
The other thing is that a ST is alot more portable than a LT, then theres the question of what are you using it for and what are you future intentions. If you are going for observational usage why are you going a 80mm refractor?
Post up a bit more detail and we can help you from there.
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