Just recently, I handled a chinook and was shocked by its weight. It is really so big and strong that I feel it is going towards the unnecessary, esp for EDC were size, comfort and convenience is a factor.
However, these things are all very personal, so different people will be comfortable with different things.
I feel that Spyderco has made an effort to create light, strong knives, this is their strong point, so if I get a spydie, I'm looking mainly for these qualities. If I do anything else, it'll be like going into a chinese restaurant and ordering a hamburger.
I feel the starmate handle is a bit like the CQC-7 handle shape(straight, not curved)except that spyderco has tried to make it much lighter, but still strong. And to me, the starmate blade is more useful than the CQC-7B chisel-ground blade. So one could say that the starmate is the spyderco CQC-7A....but lighter with a more practical and better cutting blade.
As to the lock, light doesn't always mean weaker. It would be so easy for spyderco to make handles with lots of steel in them, so that they feel strong. But spyderco has elected to go the other way....light but strong.
I would go for the starmate, cause the blade would be more useful to me and it wouldn't make much difference EDC against the chinook.