IMO Kurusu's durability should probably be Street level, given that he's still harmed by all those incidents and he's supposed to still be a regular human (You wouldn't give RL humans who survive lion or bear attacks Wall level Durability), he just has the traditional gag harem ability to survive mostly anything and quickly recover from injuries.
Anyhow, assuming his Durability is Street and not Wall level Touma has him handily beat in endurance, combat experience, smarts and fighting skill (super weird to say this of Touma).
First of all that's not a legit reasoning. Secondly, there is literally a whole chapter mentioning how his durability is Superhuman.
Touma is still just Street level. If that was true, he'd be Island level.
guessing you have not read the novel then touma gets into an phystical altercation on multiple ocations with people who have the same physical strength as or are a saint
he fought auqa to the point that aqua physically chucked Touma across the water like a skipping stone from the top of a bridge. this knocked him out but it did not kill him. even though if were talking normal humans he should have been dead.
and aqua also has the physical strength to throw a attack helicopter durring the WW3 arc before being stripped of his saint biology later in the same arc
If you read the entire argument I'm saying that the things he has survived should put him as Street level, which should be the level for "human who survives things humans shouldn't really survive" (key word being survive, which is different from tanking). Bears and Lions are Wall level but we wouldn't put a human who survived one mauling them as Wall level. We wouldn't put a human that survives being shot with a pistol or a handgun as Wall level. They didn't tank the attack, they were hurt by it. Same with Kurusu, he's hurt by all those incidents.
By the same reasoning Touma has plenty of evidence putting him as Wall level, such as surviving some of Accelerator's attacks like the metal beam and the mini-tornado, Acqua launching across a river with enough strength he skips several times across the water, Acqua throwing him into Carissa so fast Touma punches her kilometers away, a thick tree breaking down before his body when Silvia is punching him, etc.