Just to balance up the opinions, there's a lot to be said for the convenience and user friendliness of an 8"LX90 or Celestron equivalent. They are quick to set-up and align, the observing position is always comfortable and they will find and track objects easily. You can buy one used then sell it after a year or two without a big loss, should you discover that your interests require different equipment.
Schmidt cassegrains, semi-apo refractors and Chinese dobsonians are all middle tier scopes with variable optical quality, but generally decent, so I wouldn't get too caught up in which type has better optics when you're just getting into the hobby. Other factors are likely to be more important.
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