Ghostly phenomena vs Ghosts: Which Should You Read?

Both live on shelves: Ghosts

Ghostly phenomena Elliott O'Donnell · 1910 ★★★★☆ 3.6 99 pages · ≈ 1 h 50 m · Challenging Find on Amazon

Ghosts

Ghosts Owen Davies · 2010 1440 pages · ≈ 26 h 40 m · Moderate Find on Amazon

The verdict

Ghostly phenomena is the quicker read — about 1 hours vs 26 for Ghosts.
Ghosts is the easier read (Moderate), Ghostly phenomena more demanding (Challenging).