Using additional antennas and signal processing techniques to build a full-duplex radio is becoming a popular topic in the networking research community. However, additional antennas are used for MIMO (multiple input multiple output) transmissions, traditionally, and it is well-known that increasing the number of antennas on either transmitter or receiver side increases the MIMO link capacity. Therefore, deployment of extra antennas on a transceiver has twofold applications, first increasing the capacity of half-duplex MIMO link, second providing full-duplex capability for the radio. In this work, we look at the performance comparison between using multiple-antennas for capacity enhancement in a half-duplex MIMO link with that of utilizing them to build a full-duplex radio. Our results indicate that under certain conditions, using additional antennas for building full-duplex radio can provide performance boost compared to utilizing them to form a high capacity MIMO link