The old Six-Pack order ran thus (back when I had season tickets to six teams) - scheduling conflicts were resolved in favour of the team having fewer home matches, with the inviolable proviso that a live match, to which I have a ticket, will ALWAYS take priority over one on the telly/radio:
1 Redskins (8 home fixtures)
2 DC United (15 or so)
3 Mystics (17)
4-5 Capitals/Wizards (41 each)
6 Nationals (81)
It's not quite that straightforward now since I no longer hold Caps, Skins or United season tickets (I may return to United though if the proposed Buzzards Point stadium, which is currently getting rather a chilly reception from local leaders, ultimately comes off). Mention should also be made of Chelsea FC, where I attend two or three matches annually on my London trips, but they would not fit into the above scale since it's rather difficult to attend a match in Washington and another in London on the same day (tickets to any DC-area matches I miss while travelling are normally either made available to seat-mates or posted on various resale windows).