Doctor Who probably blows away other audio dramas based on a Television show full stop. No one else is that crazy
Odd to think there could well be more hours of Paul McGann playing the Doctor, than there are of William Shatner as James T Kirk.
Big Finish would have loved to have got hold of Trek - they could have released 4 a month (single reader personal logs perhaps?) without running out of possibilities or actors. But I think the rights were unavailible due to the movie revival.