1. Location: The inner city is more of Jason and Dick's turf that Scott's but it is not that huge of an issue. It will give them a bit of a bonus when using their biggest advantage as will be discussed in a bit.
2. A day of prep: Scott is a master strategies, when it comes to combat tactics he is a beast. However he is more of the spur of the moment strategist, or planning the assault type strategist, as opposed to the mage a gadget type strategist. That being said, it should be pretty even.
3. Personal abilities.
Scott is a good fighter, a great tactician and has his optic blast that will one shot any of them if he hits them with it.
Team Batkids have an advantage though in the thing they need to focus on to win, stealth. Their best chance to win is to sneak up on Scott and take him by surprise. While they aregreat unarmed fighters, it would be unwise for them to engage in an actual upfront fight because all Scott will need is to be able to see them enough to get one shot.
If they can stay stealthed the whole time and catch him by surprise I would say Batkids 7/10.
If they try to actually fight him without a one shot sneak attack Scott wins 7/10.
I will not be leaving out criticism of this OP or any other, if you do not know anything about the actual characters do not use them. Even better if you do not know anything about comics just plain leave.