COLOSSEO
Colosseo's extremely long sight line at the robots starting point is a good opportunity to play snipers, long range heroes or heroes like Junkrat. The whole map is pretty narrow and enclosed, and it gets even worse when the robot reaches the halfway checkpoint where there's a bend as well as a bridge that enemies can look down onto the point from. Splash damage and AOE damage will be useful on this map and Kiriko's Suzu will be crucial against anti-nades that are easier to hit and ultimates that affect large surrounding areas.
NEW QUEEN STREET
New Queen Street has a high vertical skybox and lots of natural cover. It is very narrow and heroes like Sigma, Reinhardt and Junkrat will excel in this enivronment. There are a bunch of hiding places and flanking areas making it ideal for heroes like Pharah or Echo as it allows them to attack their opponents from multiple angles before they are able to retreat into easy cover. Mobile compositions are good to with lots of healthpacks scattered in the hidden areas as well. Following the robot should mostly be avoided as you only need 1 person on there since, unlike other maps, the robot is not affected by how many people are on it at once.
ESPERANCA
Esperanca provides a lot of flanking opportunties for damage heroes with shortcuts leading to the robot being placed all over the map as well as to the highground, and the enemies side. Focus on high damage heroes like damage boost, Ashe, Bastion, Pharah - relatively long ranged heroes will mostly always be a good pick. Even splash damage heroes will be good as the map tends to narrow down.