2 blogs with same keyword

Hi, everybody!
I have 2 domains with same name but in different zones:
mydomain.com and mydomain.net

Can you explain me what will be the best:
1. make a blog for each domain with same keyword
or
2. make 1 blog on .com and then redirect .net to .com ?

Tnx.

I think u should create 2 different blogs

I am for option 1!