I guess I meant in a war like conflict who would be the ultimate solider. Braum would be a front line man defending his fellow conrads. And if all champs were left loose to create havoc or prevent it. (Fiddlesticks and Nocturne released on world gg life)
All champions as they are, barring theoretical infinities like Xerath, Syndra, Veigar, or Nasus, it'd probably be
. Fast, extremely hard to kill, very dangerous in close combat. Able to smack people with holy fire at a range only slightly less than that of a handgun (Let's see your ballistic vest stop THAT!) and greater than that of a shotgun. And since she's been at war for thousands of years, she's probably a hell of a strategist and tactician too.
Plus every Abrahamic religion in the world would probably side with the angel. She'd prolly be BFFs with the Pope.
For runners-up,
would be extremely dangerous due to the modern reliance on technology (Hack ALL the missiles!) and
simply due to the fact he's a long-term planner who is brilliant with strategy and tactics, all of which are very important in armed conflict.