Either should survive fine as long as you keep all the original packaging and transport the box upright, the latter point being a must for plasmas. It's merely a recommendation for LCDs, but worth sticking to, as they're less likely to have something stacked or dropped on them if the box is upright.
Screen life? Well the half-life of a plasma (ie the time until the screen is down to half its original brightness) is usually given as around 50,000 hours, while LCDs last longer and can be revitalised with the replacement of their backlight source. Whether such a repair will be economically viable in the future, given the way prices of new sets are tumbling, is another matter.
To put that into some kind of perspective, assuming 4 hours' viewing a day, that's about 34 years for a plasma, and more for an LCD. I'm fairly confident you might be looking to replace the TV with something more up to date well before then...
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