Re: I'm touched by the weirdness of this request...
>I think Dirk Gently was the best book Adams wrote.
I agree - and I believe it shows Adams' evolution as a writer paralleled Pratchett's in some ways. They both started with gag-driven works, with little or no characterization, and with no plot to speak of beyond a flimsy framework to hang gags to - that's particularly the case for Adams' Hitchhiker books, but also for the first few Discworld books (especially the Rincewind the Wizzard series). As they both matured as writers, their later books become less dependent on gags, the plots become interesting in themselves, and the characters grow deeper and better fleshed.
Pratchett grew immeasurably as a writer - amazingly, without losing his humor; his later books are still laugh out loud funny. I think the Dirk Gently books show Adams was following a similar path. It's a tragedy Adams died so young; I think his best work was still ahead of him.