For mountain bike, Mountain Morph. Mine died in action this morning after best part of 10 years service, the handle snapped off the piston inside and piston is jammed in the body so it's definitely the end (huge thanks to the bloke who lent me a pump on the Union Canal and saved me a 5km walk into work, by the way).
Looked at the Leynze HVG one and it looked really fiddly with lots of threads and stuff so I decided it wouldn't be as idiot proof and might struggle to use it with cold hands when the Puncture Fairy visits. By 1pm I had a new Mountain Morph. 🙂
On the road a nice long frame fit pump is the real deal – nothing else comes close and they don't weigh much at all.