If you're a Mac user who thrives on automation and advanced workflows, Alfred is your best bet. Its speed and deep functionality cater to power users who need a reliable launcher that allows extensive customization and workflow automations. Just keep in mind that the best features are locked behind the paid Powerpack, but it's a one-time purchase rather than a recurring subscription.
On the other hand, if you're part of a business or organization that requires robust and secure PDF processing across multiple platforms, Stirling-PDF stands out. Its open-source nature and ability to handle high-volume document processing make it suitable for those in high-security environments, though the cost can increase with usage. However, if you rely heavily on mobile capabilities, you might want to consider alternatives, as Stirling-PDF's mobile functionality is limited.