If they were the only two options the the 60 is way way better than the double stack PST. The pst has appalling focus, is difficult to use for photography and is just generally clunky. Having used both and a Lunt 60, i'd save my pennies a bit longer and get the Lunt, go second hand if you can get a look through it. As stated elsewhere solar scopes are patchy, Paul got two bad units recently and the third was finally okay, and that was at the more expensive end. Get a look through a good one before you buy.
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