The best scope is the one that you will use the most...
8 inch is a nice sized scope that will do a lot of things well.
Yes, larger aperture will capture more light but as has been pointed out will require a bigger mount...especially if astrophotography is something that you think you will want to venture in to eventually.
Like all things in life there are trade-offs and compromises that we all must make and there is no single "best" outfit that is the end all be all...get out and see some other people's gear before you buy if at all possible...
Good Luck!
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