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Given your requirements for terrestrial viewing as well, I'd say go with the AOE 90mm scope on the AZ mount and get an erecting diagonal also. Short tube is preferable, as it will be more stable. It just means that you will get a bit more false colour than the long tube, esp at high powers, but the increased stability (decreased wobble) will be worth it.
If you really want to view planets in detail, you need aperture. 8" Dob, 6" refractor or bigger. That does not mean you cannot view planets with a 90mm scope. Saturn's rings will still impress, as will Jupiter's moons and two main belts. You just won't see a lot more detail beyond these larger features.
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