Help choosing a detachment

I’m getting started with the army and wanted to try making a fun 2k list using an allied knight to pad out the points.

Do you have any advice on what detachment to use? I was planning on either Lions or Shield Host.

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• FACTION KEYWORD: Imperium - Adeptus Custodes
• DETACHMENT: Lions of the Emperor (Against All Odds)
• TOTAL ARMY POINTS: 1990pts
• WARLORD: Char1: Blade Champion
• ENHANCEMENT: Superior Creation (on Char1: Blade Champion)
• NUMBER OF UNITS: 8
• SECONDARY: - Bring It Down: (1x6) - Assassination: 2 Characters +++++++++++++++++++++++++++++++++++++++++++++++

Char1: 1x Blade Champion (145 pts): Warlord, Vaultswords Enhancement: Superior Creation (+25 pts) Char2: 1x Blade Champion (120 pts): Vaultswords

5x Custodian Guard (190 pts): 5 with Guardian Spear 4x Custodian Guard (150 pts): 4 with Guardian Spear

5x Custodian Wardens (260 pts) 4 with Guardian Spear 1 with Vexilla, Guardian Spear 5x Custodian Wardens (260 pts) 4 with Guardian Spear 1 with Vexilla, Guardian Spear 3x Venatari Custodians (165 pts): 3 with Venatari lance

1x Acastus Knight Porphyrion (700 pts): Titanic feet, 2x Twin magna lascannon, 2x Acastus autocannon, Acastus ironstorm missile pod

p.s. The idea was to use the Porphyrion as a shooting threat because I don’t have any Grav Tanks yet.