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If you are a visual astronomer then aperture rules, and you should invest your money in the optics, not the mount. There is not much point in a tracking EQ platform unless you want to image. You are better off with a dobsonian than an EQ based telescope.
Regarding the 4" or 5" achro refractor being better than a newtonian for planets, the answer is no. Once again, aperture rules for planets, and also the achro's will display colour fringing on bright objects (like jupiter/venus/moon) washing out detail and giving a purple fringe around the object.
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