>>106295506
Minichamp for me. Could also get away with the Rambler, but the extra features of the minichamp are worth it given now similar in size and weight they are.
Also have a CyberTool L, but it's too bulky/heavy to comfortably keep in my pocket at all times. Deluxe Tinker looks like it might be a happy medium, though I don't have one.
The most useful tool is the one you always have on you.