Birrell Clan Tartan

[GaRebel211]

Okay so over the last month or so I have finally traced my mother's side of my family back to Scotland directly to the U.S.(1717) unlike all of my other branches that either were from Ireland or were Ulster Scots. Through all of my research I learned my family (Burrell) was actually spelled Birrell or Birral depending which branch. We also have two tartans, a ancient as pictured in my avatar or the modern which has more red instead of the faded orange. So needless to say I am super exicited about getting a kilt made in one of these tartans. My question for the Rabble, which one? I would assume the ancient would be more like what my family would have had, is that correct? What dictates ancient from modern? When it was made? I am leaning toward the ancient just cause I like the look better, but I'm curious of rabbles opinion, here are the links for the two.
The Ancient
http://http://www.lochcarron.com/tartanstrome/birrell_ancient.html
The Modern
http://http://www.tartanregister.gov.uk/tartanDetails.aspx?ref=264

Also if anyone knows any history of the Birrell clan, I'd be most grateful.