wi-fi USB or PCMCIA

What model of laptop? If it can take an internal mini-PCI or mini-PCIe card, that's usually best. The Atheros 802.11 b/g cards are easiest. If it's old enough that it can't do that, the USB ports might only be USB 1. But PC cards aren't necessarily better, and there are several different kinds. So the choices depend on the machine.
 
My notebook is a CCE t35l, manufactured in Brazil

See link.

The notebook has realtek wireless b/g, but I have problems with this wifi card, link.

Preferably a wireless b/g/n.
 
Ah, it's a new machine. If it were me, I'd replace the internal mini-PCIe card with something supported, like Atheros 5424. On some machines, that's easy.

USB should work, but again it's a matter of which chipset. AFAIK, 802.11 n is not supported on FreeBSD yet, although work is under way.
 
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