Transfer contents of an old computer to a new computer
I would like to transfer my old Mac mini to a new Mac mini by connecting them together with a cable.
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The fastest, easiest and most reliably way to Migrate (transfer) to a new Mac. Is to plug your external Time Machine backup drive into the new Mac and Migrate from it during the initial setup.
Using a direct ethernet to ethernet cable is another way to Migrate during the initial setup, but it is slower than using your external Time Machine backup drive.
Using your local Wi-Fi network is another way, but it is really slow and is prone to fail during large Migrations.
see > Transfer to a new Mac with Migration Assistant - Apple Support