Usb Pc5750 Adaptor Wireless Modem Or Wireless PC / Air Card For Laptop Travel?

Wireless Modem or wireless PC / Air card for laptop travel? - usb pc5750 adaptor

I have Verizon Internet service and need my laptop. Verizon sells a USB modem, but Verizon Wireless AirCard ® 595 and PC5750 PC Card. Who is traveling faster and better laptop? And what is the difference between the two cards? Thank you!