Hmmmm... two deciding factors: How much weight do you plan on carrying, and are you running front panniers?

If the answers are "quite a bit" and "yes" I would go with the Nomad. It will carry more weight and compromise the handling of the bike less than a BOB. The front panniers also combine with the tongue weight of the trailer and the rider weight such that (if you do it right) you wind up with about a 50/50 weight distribution over the wheels. The Nomad is a solid choice, nigh indestructible, and will carry just about anything, especially with the optional cargo rack.

Otherwise it is personal preference. I never liked the "tippyness" of the BOB, and never liked the added resistance of the Nomad. As was mentioned, drivers will give the Nomad more room when passing, especially if you do something creative with your flags.



One more thing to consider: if you get the Nomad, you will be tempted to bring WAY more stuff than you need. Ours is retired to grocery duties, and we can get 12 bags worth of groceries in there. I think it is bigger on the inside than it is on the outside.