For my money the Irish Brigade. But like others here I might be a little biased. I am kinda partial to the Excelsiors too, at least until the draft sets in.
When it comes to individual regiments the Army of the Potomac has a lot of great ones, in my opinion.
One not mentioned above I don't think is the 6th. Pennsylvania Cavalry which was brigaded with the regular cavalry regiments if I remember correctly. I imagine that brigade would have considered itself a cut above the volunteer cavalry regiments. I would have if I were a regular.
John
When it comes to individual regiments the Army of the Potomac has a lot of great ones, in my opinion.
One not mentioned above I don't think is the 6th. Pennsylvania Cavalry which was brigaded with the regular cavalry regiments if I remember correctly. I imagine that brigade would have considered itself a cut above the volunteer cavalry regiments. I would have if I were a regular.
John