In reply to g taylor:
I prefer snowshoes, probably because I have used them all my life, whereas skiing has been occasional and recreational. I would also rather not break my leg on the approach, falling on skis with a 70 lbs pack. I prefer to use snowshoes winter camping in Canada, for example, where I come from, including with a pack comparable to a mountaineering pack.
A rule of thumb is to look for adequate floatation, measured in square inches, matching your own weight, plus that of your gear and pack, to the capacity of the shoe.
Here is one measure to use:
Weight ............... Floatation
up to 155 lbs ........ 170 sq.inches
up to 170 lbs ........ 200 sq.inches
up to 220 lbs ........ 270 sq.inches
over 220 lbs ........ 360 sq.inches
Snow quality, ie powder versus packed or wet, makes a huge difference, but these numbers are a starting point.
Many modern snowshoes have all kinds of modular ways of adding and subtracting floatation, with tails, etc. They are light-weight and easy to carry, and they don't absorb water (and hence, weight) the way other materials do.
Personally, I prefer older-style shoes, as they are easier to repair in the bush, if you are out for several days and have to depend on your shoes to get you back to civilization. This is not so important if you are in a large group, breaking trail, or close to home/car.
Whatever you buy, bring a variety of bolts, nuts and washers, and material to replace straps, if you are using synthetic shoes, as straps and rivets will break or pop, regularly, with the offending part disappearing in the snow, usually a step or two before you notice the problem.
I have used Tubbs snowshoes during a multi-day backcountry ice climbing trip in Western Newfoundland (deep snow, wet climate), and found they couldn't take the beating that comes with the terrain, bindings and rivets breaking due to the ever-changing angle of the ground. I don't know if it is the design or the nature of the beast.
Good luck!