I had the chance to use a SkyWatcher refractor 102/500 with the HEQ5 on its tripod and on its pier. They seems to offer the same stability as the vibration dumped in roughly 0.7 second for both.
The advantage of the pier is that you can use any type of telescope has the optical tube would not hit the legs of tripod. However, the pier is 15.10 kg while the tripod only 5.35kg.
I would suggest to use the pier for an observatory and the tripod if you observe in more than one location.
The AZ-EQ6 is much bigger and stable of the HEQ5 but I would buy the AZ-EQ6 only if you have in mind to use on it a heavier telescope.
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