Mini tub tire size question

Housing end to housing end is 47 1/2"
After looking at both tires to compare
Hooiser
31x13.5-15
Tire diameter: 30.9
Section width: 14.10 (358mm)
Tread width: 11

Mickey
315x60-15
Tire diameter: 30.08
Section width: 13.3 (337.8mm)
Tread width: 11.73

Both measured on a 10" rim. Section width when converted is 20mm wider. Was just looking at options, it's a twin turbo car just trying to get the best tire for it but looks like it's just keep the 315s on it, has a wider tread for grip.