I personally use a N3 just because the display is slightly larger than the L&B Viso. Also like the fact that N3 is rechargable via usb so no battery woes. On a minus note the logbook data is suspect at best so if you're a bit geeky about freefall speeds etc take the logbook info with a generous pinch of salt ( wrist mount mine so opinions on my last point may differ ). Plus points: Great visual alti Useful for canopy control Loud audible beeps ( If required ) Can be used has a helmet audible.
Have many friends that use the L&B Viso without complaint So if you can live with a slightly smaller display and the need for the occasional battery change i'm sure you'll be happy.
They are both good pieces of kit, however, the Viso has to have one of the most complicated button sequence menus I've ever seen. Where the N3 screen menus are straight forward the Viso requires you to have the manual handy to reference how to change the settings. If I handed you a N3 without any instructions you could figure it out in a few seconds, the Viso, not so much.
N3....battery life blows. I quit using it for that reason alone. The Viso will give a year + of battery life. N3, a weekend of active jumping. N3 allows you to put your own audio in, and it acts as an audible, which the Viso cannot do. I disagree with Scott about the menus being difficult; they're quite intuitive and not terribly different from the Optima or Altitrack.
Having both, I prefer the VisoII. If nothing else, look at the threads (there are dozens) about customer service from L&B found here on DZ.com
I'd be happy using either. They both show the altitude and that is what I want.
All the geek features, I'm not personally bothered about, that is what my protrack is for.
What would make me want to choose a Viso from the 2 options is L&B's customer service. It is quite simply the best in the world. They'll fix any problem pretty much in a way well beyond what you were expecting. The awesomeness of their customer service has made me decide to only use L&B for these sort of things.
If I were to go by the numbers my fastest freefall speed was almost mach 1
Don't know about your unit specifically but: Weird "maximum" numbers do show up on different devices. I trust average speeds much more than maxima. Even with some internal averaging, changes in airflow can cause weird effects. (Eg, the trace from my Protrack, mounted outside a helmet, shows say 160 mph maximum every time I track off from an RW jump -- something that clearly isn't true or I would have been kicked off bigways long ago.)