Compiler optimization setting

[patters]

Is it a good idea to use -O3? I know typically there are trade-offs - like loop unrolling can make code bigger in order to become faster. Is there much of a difference for ZX Basic between -O2 and -O3? Am I better off sticking to the default -O2 since it's more tried and tested?
Or since I'm not yet running into memory limits should I use -O3 while I can?