Got any quantitative test results to back that up? I have 1/4" and 1/2" HF torque wrenches and they both test within +/-5% at mid range. Can you buy a much better wrench for a lot more money? Sure. But it's a bicycle, not a Delta V rocket -- the need for extreme precision and accuracy simply doesn't exist.

OP, the cheapest, crappiest torque wrench you can find will be plenty good enough for bicycle use. If you're only dealing with the basic stuff, the Ritchey torque keys are pre-set and super convenient. I use them to assemble my bike when traveling since they pack much smaller and lighter than a "proper" torque wrench.