Regardless of what brand you buy, buy one that has the torque range you have to adjust "in the middle". The end of the scale (both sides) is where torque wrenches tend to be not very accurate. This will mean you need at least two, possibly even three wrenches if you work on modern engines and want to do it "by the book". I've seen people break valve covers on Alfa romeo 16V TS engines because they didn't have a 1/4 torque wrench and thought they could "feel" how much torque the bolts needed. The amount of thread repairs required on heads and other aluminum parts quickly becomes more expensive than purchasing the proper tools. Don't skimp on good tools, you'll save the money in repairs you'll have to do again, if you work on cars more often than your own restoration.
Several brands buy from the same manufacturing plants. Some have custom runs done with special quality requirements, but often, you can buy the same wrench with only the brand name and type number that's different. Often, the quality brand name will be much more expensive than the "generic" wrench. It's worth spending some time investigating.
When purchasing second hand, be aware that these tools wear out and my need re-certification/calibration. Often, money saved on purchase is more than lost on getting the tool into the shape required to do the job properly.