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In a nutshell, the pst alone will give good detail at the edge of the solar disk (prominences) while the double stack will give good detail across the disk as well.
A novice observer will find the solar disk uninspiring through the pst alone, though with practice you'll be able to tease out most of the detail that's visible through a double stacked instrument. The double stack boosts contrast making features across the disk visible at a glance.
Lunt also sells an introductory 35mm scope but finding one in stock could be a problem. The Lunt 35mm has a front mounted, full apeture etalon which should result in no sweet spot.
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