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Hi Justin - the surface area of your primary mirror is over 50% more in your 10" than an 8". 10 squared = 100, 8 squared = 64 (pi*r sq for the area of a circle). That alone would give you an indication as to the numerical logic.
One question I would ask though is do you have an intention of going to star parties, have a friend or relative with a farm or joining an astronomy club with access to dark skies. If you answered yes to one or all of these then your first question is portability. The second is then can you physically lift your shiny new telescope in to your car and will it then fit?
Depending on that answer is where your decision lies in my opinion. Not much point in having a 10" if you stuck under light polluted urban skies with no chance of taking it to a dark sky. I'd get the 8", very portable and will give you the opportunity of getting to star parties, looking through other peoples light buckets.
The very first thing you should do is get to your local astronomy club or star party (check the star party listing on IIS for your nearest) and ask your questions. The members are very friendly like any hobbyist who has someone interested in their passion. Alternatively your local astronomy retailer and actually see one of these things of beauty in the flesh. Read specialised astronomy retailer, eg Bintel, not shops that sell telescopes.
So while I haven't directly answered your question I hope my insight helps to clear things a bit for you.
All the best and keep asking questions.
Wayne
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