Difficult to judge the best AP Project album. I think every album has the odd track or two that let it down. I listened to all of them incessantly except perhaps Vulture Culture and Gaudi about 20 odd years ago, and recently started listening to some of them again. Eye In The Sky is otherwise really solid but let down by Gemini and Silence & I, and Step by Step is neither here nor there. The Eagle Will Rise Again is kinda meh on Pyramid. There's some good stuff on Eve, but I find it to be pretty sexist. For mine, their best albums are Turn Of A Friendly Card (if only for the guitar solo on Nothing Left to Lose) or Ammonia Avenue.
And as for DG - About Face. His first album showed how much he needed Roger's help, and On An Island was more mature, but needed some more grunt here and there. More tracks like Take A Breath.