When I go on my hunting trip in September out in the desert there is usually some awesome storm heads. I took this video last year http://www.vimeo.com/370008 and cought some lightning.

Im wondering if doing video and speeding it up in post would be better than using a DSLR at 2 second intervals to catch the lightning?

Any thoughts

I think they are better for smooth output of 'shorter' durations for sure...

If your looking to catch lighting I think the best solution is to stretch your exposure out and minimize the unexposed gap. So if you go with a ND filter and stop down your lens to F/10 or a bit smaller you could do for example 2sec exposures and space them say 3sec... If possible even go with 2.5sec exposures and 3sec intervals. That will catch some lightning if it's around.

I think for some types of shots, yes. Like that dude who posted the timelapse at the baseball stadium, day to night. I think video cams are better for day-to-night, surise, etc - as Milapse pointed out in another thread - because they are designed to shoot continuous, so the settings don't jump all over the place when it's on auto. The only drawback is that they cannot shoot long-exposure for stars, so you kind of have to be in an urban setting or have a full moon out.

Some drivelapse & boatlapse might be better with a vid cam, but I'm not sure.

I would say video cameras are just harder to get right. Basically theres 1 thing you have to worry about, when you render it, get rid of the interleaving on your footage

Otherwise, They can do pretty much the rest themselves.