Between the Ladybug and the Cricket, I would recommend the Cricket. I think it performs better for small chores like opening plasting and small boxes. I bought my wife a CRKT (Columbia River Knife and Tool) Delilah. It is a very small, one hand knife which she keeps on her key ring. The only problem is that the extremely sharp wharncliff (straight edge) blade shape make puncturing things like your fingers very easy. I think that the Cricket blade shape with the talon end shape is more safe and just as effective as the Delilah.
In general, for lightweight use, I always prefer a liner lock like the Cricket has. You can pull the knife out, open, use it, close it and put in away before people even realize you have a knife in your hand. Good luck. (The only advantage that the Ladybug has is the colors that are available).