I agree for general walking and scrambling the airtechs will be more useful.
Bear in mind if you are choosing crampons for climbing at some point that boots to fit feet (if you can call such gargantuan appendages feet) of your size, then the boot tends to flex more so you may need a stiffer crampon/
Purely for walking / winter scrambles, i'd go for the Airtechs as they're lighter and easier to walk in due to the short points. (A friend has the North Ridge ones and the strapping system always seems to take an age to fit.)
If you forsee yourself doing any winter climbing in future, get the G12s.
There isn't much difference between them both and for winter walking and very easy stuff the air techs would be the one I would go for.
If on the other hand you feel that maybe in a couple of years you would like to go on and try some easy winter climbs and stuff then the g12s would be my choice.
Either would be great for both by the way but just my 2p
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