From ExifTool · onemedia docs

Basis: the ExifTool application documentation (https://exiftool.org/exiftool_pod.html) and the QuickTime, GPS and Composite tag-name pages (https://exiftool.org/TagNames/), fetched 2026-11-02; each flag and tag below was found on them. ExifTool 13.60 is the version run as an oracle in OneMedia's tests. The Perl source and modules were not read. ExifTool is a command-line tool; OneMedia is a library, so the map is flag to call.

ExifTool	OneMedia
`exiftool file`	`Media.Open(path)`; CLI: `onemedia info file`, `onemedia tags file`
`-Make -Model`	`media.Device.Make`, `media.Device.Model` (`Fact<string>`)
`-CreateDate`, `-DateTimeOriginal`, and the `QuickTimeUTC` API option (`-api QuickTimeUTC=1`; documented on the QuickTime page)	`media.CaptureTime` (candidates with source and time-zone certainty, plus the resolved value)
`-GPSPosition` (a Composite tag)	`media.Location`
`-Rotation` (QuickTime tag, also a writable Composite tag)	`media.Rotation`
`-G1 -a -s` (all tags with their group)	`media.Native[system, key]`, `media.Native.Find(system, key)`; the system names the group
`-ee` (embedded telemetry: GPMF, CAMM, `mebx`)	`media.Telemetry` (typed samples), `media.OpenTelemetry(track)`
`-Title=x -Artist=y`	`media.Tags.Title = "x"; media.Tags.Artist = "y"; media.SaveAs(out)`
`-CreateDate=...` on a video	`Media.SetCaptureTime(in, out, DateTimeOffset)` (writes every date field the file has, with a report)
`-GPS:all=` (group delete, note 4 of the application docs)	`Media.StripLocation(in, out)`
`-SerialNumber=` and other device tags	`Media.StripDeviceIds(in, out)`
`-overwrite_original`	`media.Save()` (atomic replace); the default is a new file via `SaveAs`
`-overwrite_original_in_place` (copies the temp file over the original)	no equivalent: `media.SaveInPlace()` is different, it writes only within existing padding and throws `PaddingRequiredException` otherwise
`-json`, `-csv`	typed objects; serialise what you need
the `Warning` and `Error` tags (`-a` shows duplicates)	`media.Defects`
`-ee` on still images, MakerNotes, IPTC, XMP in JPEG	out of scope

using RecursiveAI.OneMedia;
using (MediaFile media = Media.Open("located.mp4"))
    _ = media.Native["QuickTime", "©xyz"];
Media.SetCaptureTime("in.mp4", "dated.mp4", new DateTimeOffset(2024, 5, 1, 12, 0, 0, TimeSpan.FromHours(2)));
Media.StripLocation("located.mp4", "nolocation.mp4");
Media.StripDeviceIds("located.mp4", "nodevice.mp4");

Differences that matter

A resolver instead of a flag. ExifTool shows each date tag and leaves the choice to you (or to -api QuickTimeUTC). OneMedia lists the candidates and picks one by a documented precedence (docs/facts.md); media.Resolver can be replaced.
Writes are reported. SetCaptureTime and Save* return what was written and what could not be represented; they do not change media bytes (the per-track payload hash stays the same).
Strip is documented, not exhaustive. It removes the documented location and device fields in every system and telemetry track; it does not search free text, unknown vendor atoms or trailers (docs/strip.md).
Parity is checked, not assumed. Reads are compared against ExifTool 13.60 on the test corpus; docs/facts.md lists the differences that remain.