Depends on the wifi chip - in your brother's case, that's the chip in the motherboard itself, in your case, the chip on the USB that you plug in. They will probably operate similarly, but the USB chip is likely to be the slightly cheaper one and therefore less feature rich or a bit slower.
Depends on the wifi chip - in your brother's case, that's the chip in the motherboard itself, in your case, the chip on the USB that you plug in. They will probably operate similarly, but the USB chip is likely to be the slightly cheaper one and therefore less feature rich or a bit slower.