Just noticed this thread and of course I cannot control myself from trotting with this hobbyhorse of mine again:

The major difference between anglo and english concerning the option playing energetically and rhythmically is the HANDLE... ( i e the poor stability the english type offers) .It is in principle impossible to get the same bouncy rhythm as in trad morris anglo playing using an english....
UNLESS the handle is modified so that the stability ( the connection between hand and instrument) is enlarged. This can be done by using a steadier thumbstrap,combined with a wrist support, and a suitable wriststrap.. BUT of course this means that the available keyboard range is somewhat reduced. For most folk music however you may get along pretty well with 40 keys ( or even 32) You reach more buttons transversely ( as with the anglo or Jeffries or Hayden duet) than longitudinally ( as with the english)

For speed...selfevidently the english system is the "fastest" ...you use two hands for the same job as one with other systems