What are the different types of Office 365 migration, and which one is best for my organization?

Your four types are the right core list, here's a practical breakdown of when each actually makes sense:

Cutover Migration — moves everyone at once, best fit for exactly your situation. Under 150 mailboxes is the range Microsoft itself generally recommends for cutover, since the whole batch needs to be migrated in a single window without staging. Downside: less room to catch problems mid-way since it's all-or-nothing.

Staged Migration — migrates users in batches over time, useful for larger orgs where a single cutover window isn't realistic, or where you want to pilot a small group before rolling out to everyone. For under 150 users, this is usually more process than you need.

Hybrid Migration — keeps some mailboxes on-premises and some in the cloud simultaneously, long-term coexistence, not just a migration method. This is the right call if you need Exchange on-prem and Exchange Online to coexist indefinitely, not a typical fit for a small org doing a one-time move.

IMAP Migration — used specifically when your source isn't Exchange at all (Gmail, or another IMAP-based host). One real limitation worth knowing: IMAP only moves email, no calendars or contacts, since IMAP as a protocol doesn't carry that data.

For your specific case (under 150 users), cutover is the standard recommendation, assuming you're moving from Exchange. If you want more control than the native cutover wizard gives you, mailbox mapping, filtering, incremental sync handled automatically, EdbMails Office 365 Migration Tool supports all these migration types, so you're not locked into one method if your needs change partway through, no PowerShell scripting either way.