Not tried the two foods you mention, but some time ago when Toby went off the Naturediet dry I tried him on Pooch and Mutt and he loves it as does Minstrel who I tried it on when he kept leaving the ND wet food. They now both have Pooch and Mutt Calm and Relaxed which is grain free with a small portion of Forthglade wet 'Just' Duck, Turkey or Lamb mixed in.
P&M don't rate that highly on All about dogfood (about 3.
, but as dogs can't read and it suits them. I'm not too worried. It's about £35 per 10k bag from Pets at HOme, free delivery. P&M also do treats either with rice or grain free.
I thought about trying Branston on it, but a bit worried as he tends to bolt his food.