Small-group roleplaying needs a system or adventure that supports the actual number of people at the table. Solo play can use prompts, an oracle, a journaling structure, or rules for resolving uncertainty without a conventional game master.
What to compare
Supported roles
Check whether the material is designed for one player, one player plus a game master, or a small party. Those arrangements are not interchangeable.
Decision ownership
Identify which choices the player makes and which are delegated to prompts or random tables. Choose the balance of surprise and authoring that you enjoy.
Workload
Consider whether one person must manage several characters, encounter adjustments, notes, and world details. Keep the first session manageable.
A detail worth checking
An adventure designed around a larger party may need more than simply removing characters. Verify the system guidance before assuming encounters remain appropriate.
Make your next session easier
Choose a short scenario with explicit support for your group size. Keep notes on unresolved questions so the story can resume without recreating the entire session.

