With the camera and lenses you intend to use, I would recommend the Polarie too.
There is nothing wrong with the Astrotrac (quite the opposite, it can handle small scopes with ease, I have used my Stellavue70ED @ 420mm without issue) just that for what you will be doing the Polarie is the less expensive option.
If you think you may be tempted to use longer lenses or a short scope in the near future, then maybe look at the Astrotrac.
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