I agree with what others have already observed.
Your Mac Pro is achieving an adjusted (for interference) transmit rate of 585M bits/sec, which is very good.
I do not see any problems there. It is using 80MHz in the faster 5GHz band, where there is less interference. If it seems slow, then problems other than Wi-Fi antennas are likely to blame.
Your MacBook Pro, on the other hand, appears to be stuck on the 2.4GHz band, where most of those other Networks are likely to be. Net -26Db (-87-61) is good signal strength, so extended antenna would probably not help you any. Using 20MHz channel and being only able to hit 78 M bits/sec means you are seeing interference on that channel.
I do not know why it did not pick up the 5GHz channel, unless you are too far away from your Router (5GHZ falls off faster with distance).
If your Router channel is set to "automatic", and you cycle the Power on your Router (or Restart it) it will scan the airwaves and choose the channel (on each band) that is least busy at the moment. That is one reason why every debugging procedure starts with "Cycle the power on your Router")