Before the old NFL and AFL came together the Chiefs were the team I rooted for in the AFL. But that was NOT a case of two favorites... Rams were my team. Had the Rams played the Chiefs back then I would have wanted the Rams to trounce them.
After they leagues joined I still had a soft spot for the Chiefs but no.... I didn't actually follow them.
The Chargers I have always liked. But again... there was, is, and always will be only the Rams. Since my grandsons like the Bronco's and the Chargers I will root for both as long as they aren't playing the Rams. If the Rams are eliminated I will root for the Bronco's and Chargers VERY strenuously... I WANT them to win... but again, they are not the Rams and there is no comparison. - JamesJM