[Pf2e]Trying to make mounted kobold champion

Hey as my last character, ranger died in AV, im looking to make kobold champion, but cant decide between two flavors of build:

1. Here is the build link for Kobold champ summ. To view this build you need to open it on an android device with version 196+ Pathbuilder 2e installed. https://pathbuilder2e.com/launch.html?build=485517 Champ, shield ally, with summoner dedication, dragon steed form.

2. Here is the build link for Kobold champ cavalier. To view this build you need to open it on an android device with version 196+ Pathbuilder 2e installed. https://pathbuilder2e.com/launch.html?build=484839

Champ with cavalier dedication, mature draft lizard.

Eidolon pros: dont take double damage from aoe, spellcasting, fire breathing Eidolon cons: less hp, no "free" actions (tandems). Cavalier pros: more hp, better attacks, better ac later due to feats, free action from mature. Cavalier cons: takes dmg from aoe, will need to be given commands if need to double stride.

Imo action economy is better with cavalier, but summoner provides spell casting and versatily... Im lost.