WATE has traditionally been my default answer though it is difficult for me to definitively narrow it down to a single album only because I like different ones for completely different reasons.
PP&P2, The Sky Road and Pathways & Promenades are among my favourite instrumental albums, and I love playing them in the car when I'm travelling, The music virtually plays out like a soundtrack to the visuals of open highway and rural scenes.
But then how do I compare that pleasant experience to TG&TG and WATE which are probably my two favourite song-based albums? Between those two, I honestly couldn't tell you which I like better.
As for a favourite track...
I've always been strangely enchanted by Tibetan Yak Music (from PP&P1). It's a delicate piece played on 12-string and if you love the sound of that instrument, you're in heaven. For me it seems to encapsulate what makes Ant such a unique and endearing artist..