Well, views vs. theoretical views? Zealand and Waumbec are probably the most socked in by trees. I guess if the question is, what peak can be seen from the view other peaks I would guess it's Moriah or one of the Carters, since most of the range is blocked by the Presidentials. I would guess you can only see Moriah from Cabot, Waumbec, Madison, Adams, Jefferson, Washington, Middle Carter, Carter Dome, and maybe Isolation.
Here's the whole list, per Smith and Dickerman:
1. Washington, Carrigain - 43
3. Osceola, East Osceola, North Hancock - 41
6. Jefferson, Passaconaway, Whiteface - 40
9. Cabot - 39
10. Lafayette, Lincoln, Bond - 38
13. South Hancock - 37
14. Middle Tripyramid, North Tripyramid, Tecumseh, Waumbek - 36
18. South Twin - 35
19. Moosilauke - 34
20. Flume, Willey - 33
22. Eisenhower, Liberty, Monroe
25. Adams - 31
26. Garfield, Jackson, Pierce - 30
29. Carter Dome, Isolation - 29
31. Bondcliff, Field - 28
33. North Twin - 27
34. Wildcat A - 26
35. Wildcat D - 24
36. Hale, West Bond - 23
38. Middle Carter, Owl's Head, North Kinsman - 22
41. South Kinsman, Tom - 21
43. Zealand - 20
44. South Carter - 19
45. Cannon - 16
46. Galehead - 11
47. Madison - 10
48. Moriah - 8
ON EDIT: Moriah, per Peakfinder.com, can see Carter Dome, Middle Carter, Washington, Jefferson, Adams, Madison, Waumbek and Cabot. Madison, despite its high stature, can see only Moriah, Middle and South Carter, Carter Dome, Wildcat A and D, Washington, Adams, Waumbek and Cabot.