A USB stick such as the Archer T2U Nano or T4U Plus moves from one machine to another and installs in moments; a PCIe card, the TX3000E or TX55E for example, stays inside a desktop and brings external antennas and often Bluetooth with it, which shows in the signal reach. Speed figures vary from the Nano's 433 megabits to the Archer TXE70UH's 5400 megabits. Look at the supported Wi-Fi generation as well — an old AC model will not make full use of a Wi-Fi 6 router.
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A USB stick such as the Archer T2U Nano or T4U Plus moves from one machine to another and installs in moments; a PCIe card, the TX3000E or TX55E for example, stays inside a desktop and brings external antennas and often Bluetooth with it, which shows in the signal reach. Speed figures vary from the Nano's 433 megabits to the Archer TXE70UH's 5400 megabits. Look at the supported Wi-Fi generation as well — an old AC model will not make full use of a Wi-Fi 6 router.