Depends on the zombie and why they are zombies
If it’s the undead coming back to life then they need to base it on the level of decay
Just like all their stats—if your missing half the muscle in your leg you should be able to run full tilt and if your missing half the grey matter then it should show as well and if the hand and such gets lopped off then it should stop moving as well
How ever if you just died and your brain and body are still pretty much in tack then you should b have and act like a normal person until such time as decay catches up and then you become a mindless creature bent on eating and such
On the flip side if it is the new “rage” zombie that seems to only know anger and speed and defies all logic it should act accordingly
If it sees something move it should go like a bat outa hell for it and not just the “survivors”
Out of the two I would prefer the first set up
Dangerous at first but as they rot away thy become less of a threat until they eventually cant hold it together any more
