Agree with Phil. The TV is wider, but the Tak is noticeably sharper, and a Parks/Masuyama clone or a Masuyama even sharper again (my Masuyama 20 is exceptional in my FSQ-85EDX).
I personally disliked all the Naglers I used - nice FOV, but I personally prefer a sharp image over a wide FOV. I specifically look for targets, not the whole sky