Based on my experience both of these frames really like a fork of around 140mm so thats a good start.
Of the two the BFe has a lower bottom bracket and a steeper headangle, which makes it responsive at low speeds but capable as speeds increase. The Ragley has a slacker head angle, a higher bottom bracket and long chainstays which makes it less involving at slow speeds where it feels a bit ponderous, but as speeds increase it becomes very confident and capable.
Pig X has the adjustable dropouts if you want to run 12mm axle or singlespeed… might be important and swing it one way or the other. Its a discontinued model though so you either pick up NOS or buy second hand. Quality was a bit hit and miss last year as well so there might be issues (My Troof broke).
I believe the 2013 Blue pig loses the adjustable dropouts but the bottom bracket is lower… which should make it a better handling bike, although they have dropped the 17″ size which is the one I would want.
Cotic get the fan love on this site and the designeer is often about for advice… you don’t get any of that from Ragley (even their website is dreadfully out of date).
Cotic for the win.