Upgrade priorities at Town Hall 10 varies depending on your focus on war or farming.

War FocusFarming Focus
Tier 1Archer Queen and Barbarian King is your main priority. Put all Dark Elixir you can into upgrading them.

Put all excess resources into walls, do not let them fall behind.

Put all Dark Elixir you can into Archer Queen and Barbarian King until maxed at your own pace.

Put all excess resources into walls.

Tier 2Laboratory to level 8.
Army Camps to level 8.
Spell Factory to level 5.
Clan Castle to level 6.
Build new Dark Elixir Drill.
Laboratory to level 8.
Army Camps to level 8.
Spell Factory to level 5.
Clan Castle to level 6.
Tier 3New Dark Elixir Drill to level 6.
Barracks to level 12.
Dark Barracks to level 7.
Build all new traps, defenses and walls.
Get them on par with Town Hall 9.
Please note, keep your Inferno Towers at level 1 for now.
Build all new traps, defenses and walls.
Get them on par with Town Hall 9.
Inferno Towers to level 3.
Tier 4Air Defenses to level 8.
Air Sweepers to level 6.
Hidden Teslas to level 8.
Skeleton Traps to level 4.
Seeking Air Mines to level 3.
Giant Bombs to level 4.
Bombs to level 7.
Spring Traps to level 5.
X-Bows to level to level 4.
Hidden Teslas to level 8.
Skeleton Traps to level 4.
Giant Bombs to level 4.
Air Defenses to level 8.
Tier 5Before you upgrade your defense further have your Archer Queen and Barbarian King at level 35 minimum.Seeking Air Mines to level 3.
Wizard Towers to level 9.
Archer Towers to level 13.
Tier 6Archer Towers to level 13.
Cannons to level 13.
Wizard Towers to level 8.
X-Bows to level to level 4.
Cannons to level 13.
Air Sweepers to level 6.
Bomb Tower to level 4.
Tier 7Inferno Towers to level 2.
Wizard Towers to level 9.
Bomb Towers to level 4.
Inferno Towers to level 3.
Mortars to level 8.
Mortars to level 8.
Bombs to level 7.
Spring Traps to level 5.
Barracks to level 12.
Dark Barracks to level 7.
Tier 8Max heroes if not maxed.
Town Hall to level 11.
Town Hall to level 11.