Load cell accuracy: rated output vs. full scale
Rated output and full scale are intended to mean roughly the same things here.

There's not a lot to choose between the two devices in terms of accuracy, both have 'about 1%' total error, and esssentially the same temperture coefficient.

There are a couple of differences.

Overload
Futek gives a safe overload of 150%. Burster indicates that a static 100% is safe, static 200% is an overload, and says 70% is the maximum for using it dynamically, recommended 50%. So you can't compare apples directly with apples here. With dynamic loading, you might want to contact the manufacturers to find out exactly what their test conditions and their failure criteria are.

Stiffness aka deflection
There's an order of magnitude difference here, the Futek is stiffer and specifies a resonant frequency, will that matter to you?