I looked at both of these recently, and ended up going for the G700s because:
- I found it more comfortable (closer the G500s which is perfect for me).
- Infinite scroll wheel (I found the wheel on the 602 to feel a bit cheap)
- Ability to use wired if the battery dies mid gaming session.
Best thing to do would be to go to a bricks and mortar store and try them both to see which you prefer the feel of (then order from OcUK obviously
)
Edit: hmm, apparently better not to order from OcUK after all:
http://forums.overclockers.co.uk/showthread.php?t=18609124
That's disappointing from Logitech since (IMO) they do make fantastic products and have always been known for their great customer support.