When comparing Aegissub vs Subtitle Edit Pro, the Slant community recommends Aegissub for most people. In the question“What is the best subtitle creation and editing software for macOS?” Aegissub is ranked 1st while Subtitle Edit Pro is ranked 4th. The most important reason people chose Aegissub is:
Predefined shortcuts for navigating the waveform / timeline helps immensely in making quick work of setting timings for subtitles.
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Pros
Pro Predefined shortcuts
Predefined shortcuts for navigating the waveform / timeline helps immensely in making quick work of setting timings for subtitles.
Pro Karaoke friendly
Aegissub was practically designed to make stylistic karaoke subtitles.
Pro Nothing you don't need
Distraction and clutter free, not having too many options and features.
Cons
Con Expensive for what you get
Considering excellent free options out there, the pricetag for this software is steep.
Con Not ideal for projects with overlapping audio
If you use the waveform to adjust timings for subtitles, adjusting one timing, if it comes into contact with the timing of another subtitle, will push the timings for the second timing so that they do not overlap. It's nice for clean cut situations, but not ideal when subtitles need to overlap.