Both are great preamps, I own the cj premier 14 and have heard AI numerous times and almost bought a couple of times but didn't pull the trigger. The premier 14 is more neutral IMO than the earlier premier cj's - but mine responds really well to Mullard tubes. Gives it a Very rich tonal balance and palpable soundstage - voice can be scary. Depends on other equipment and tastes... good luck.
