It depends on what you will be using it for. I have 3 ranging from 4nm to 150nm and use all of them on my bike. If you want to remove both wheels then you’ll need 10nm to 130nm to correctly torque all of the bolts involved. Like all tools/measuring instruments, torque wrenches are most accurate in the middle of their ranges. I would be reluctant to use one that can go to 150nm to put 19nm of torque on a front axle pinch bolt, and I have yet to see one that can torque up the rear axle bolt and cover anything much lower than 30nm safely. Clutch and stator casing bolts require less than 10nm.