This page lists Wikipedia pages by the total amount of text in all of their talk page archives put together. It is the best measure there is for determining how much squabbling has gone on behind the scenes for a given page.

Here is a ranking of all 63 of the listed pages that are actual articles (as opposed to policy/administrative/user pages), in descending order:

1. Donald Trump
2. Intelligent design
3. Climate change
4. Barack Obama
5. United States
6. Jesus
7. Race and intelligence
8. Catholic Church
9. Circumcision
10. Homeopathy
11. Muhammad
12. Gamergate (harassment campaign)
13. Chiropractic
14. Abortion
15. Monty Hall problem
16. Gaza War (2008-2009)
17. Evolution
18. Prem Rawat
19. Sarah Palin
20. India
21. Israel
22. World War II
23. Christ myth theory
24. Mass killings under communist regimes
25. Jehovah's Witnesses
26. September 11 attacks
27. Cold fusion
28. Climatic Research Unit email controversy
29. Armenian genocide
30. Anarchism
31. Atheism
32. Falun Gong
33. Neuro-linguistic programming
34. Jerusalem
35. Control of cities during the Syrian civil war
36. Kosovo
37. British Isles
38. Transcendental Meditation
39. United Kingdom
40. George W. Bush
41. Christianity
42. COVID-19 pandemic
43. Libertarianism
44. Acupuncture
45. Thomas Jefferson
46. International recognition of Kosovo
47. Israel and apartheid
48. Adolf Hitler
49. United States and state terrorism
50. Syrian civil war
51. List of best-selling music artists
52. Julian Assange
53. Russo-Georgian War
54. Historicity of Jesus
55. Second Amendment to the United States Constitution
56. Tea Party movement
57. List of common misconceptions
58. Murder of Meredith Kercher
59. Genesis creation narrative
60. Taiwan
61. Hillary Clinton
62. Electronic cigarette
63. Michael Jackson

Bubbling under (present in earlier versions; I have gone back to 2015 so far here, though the page history goes back to 2010):

64. 0.999...
65. European Union
66. Chronic fatigue syndrome
67. Russian interference in the 2016 United States elections
68. Shakespeare authorship question
69. Fascism
70. Astrology
71. The Holocaust
72. Joseph Smith
73. Chelsea Manning
74. List of scientists who disagree with the scientific consensus on global warming [NOTE: now deleted]
75. Gibraltar
76. Ayn Rand
77. Fox News
78. Shooting of Trayvon Martin
79. Human
80. Canada
81. Islamic State of Iraq and the Levant
82. Race (human categorization)
83. Iraq War
84. Elvis Presley
85. Islam
86. Philosophy
87. Terri Schiavo case
88. Black people
89. White people
90. Palestinians
91. Mitt Romney
92. HIV
93. Occupy Wall Street
94. Jyllands-Posten Muhammad cartoons controversy
95. Elizabeth II
96. Asperger syndrome
97. Centrifugal force
98. Transnistria