What would be better?......

Test @ 1000 a week......
or
test 500 & Deca 500 a week?.....

When I say better, I mean,... any less sides with just one ester? Prob better results stacking, I know. Why does everyone say stay near 500-750 test a week, when they are doing over a gram of aas when you add the diff compounds together. Just curious...