M2TS is huge, hard to edit and does not open in phones, browsers or many editors. MP3 plays on every phone, computer, car stereo and speaker. An M2TS file usually holds H.264, VC-1 or MPEG-2 video with AC3, DTS or PCM audio. M2TS is at home in blu-ray discs and AVCHD camcorder footage; MP3 is the usual choice for music and podcasts that must play anywhere. The MP3 contains the soundtrack only; the picture is dropped.
The defaults suit most files. Under Options you can choose the bitrate and trim the start and end. This is demanding work for a browser: a long or high-resolution file can take several minutes, and your device does all of it, so keep the tab open.
The conversion uses your browser's own video and audio codecs (WebCodecs), with hardware acceleration where the device has it; the file is read from disk as it goes and can be up to 2 GB. Where the browser lacks a codec, the page falls back to the compatibility engine. MP3 is written at 192 kbps unless you choose another bitrate.