When comparing the studio albums, let us not forget the MASSIVE advantage PT has in non-studio album work.
DT has ACOS (the song), Don't Look Past Me, the five FII non-album tracks, To Live Forever, Eve, Raw Dog, Bombay Vindaloo and a few Majesty songs, right? That is less than 20 non-album track songs (if you count the Majesty songs as DT songs).
PT has Recordings (9 songs), the Nil Recurring EP (4 songs), three or four non-album tracks from both IA and DW, Insignificance (10 songs, some of which, to be fair, are reworkings are previously recorded songs), Metanoia (8 songs), Voyage 34 (4 songs), Staircase Infinities (5 songs), some of the non-album songs from the Delirium Years (10+ songs, IIRC), Revenant, etc.