i have been working with heavy stress on enzymatic antioxidants it seems to be little bit confusion that which enzymatic antioxidant show more activity
oxidative stress is a complicated situation in which, one singe factor is unable to informed you about the oxidative status! however, in order to get some first results i would suggest you to determine the activity of superoxide dismutase, glutathione peroxidase and catalase!
Firstly profiling SOD, APX, Catalyses, peroxidases will be the best option.
FYI, Proline acts as an activator in “ROS detoxification” pathways, a cell “redox balancer”. You can go for proline profiling but first make sure with the kind of stress you are working. Generally proline profiling is best for drought stressed plants.