I am new to GMing,
I am also new to both of these systems,
I am planning on creating a Sci Fi setting from scratch.
I know this will be a lot of work, and reading. I have asked the people who are wanting to play in this game ( which we are aiming to be playing a long time ) many questions about what they want. These are a few types of things they want.
A quick and understandable battle system ( after being learned, of course ),
Highly adaptable character creation,
More of a 'Role Playing' type game, ( more Star Trek, than Star Wars )
Limited or no reduced abilities from damage.
I have collaborated on homemade RPGs and got tired of the lack of a stable game system to develop stories with. I am planning for this to be a long term project so any recommendations would help ( I hope, anyways )
Also, if I do decide on Hero, which book should I start with Hero System 6th basic or Champions Complete