My personal recommendation would be the MSR Denali Evo Ascent. They’re nice and light, pack down very flat and the bindings work really well with snowboard boots. You can attach an extra section to the back if you need more float in really deep/soft snow.
They’re probably the best snowshoe around for steeper/more technical climbing if you want to use them in the Alps and get a bit more adventurous.
TSL (too many models to name!) are quite a bit cheaper, but in general they have pretty poor lateral grip, which you’ll find a major hassle if you start using them on steeper ground or in harder snow. I think they have started making some with “cookie cutter” type spikes on the base rather than the daft wee round points they usually have.
But really, you want a splitboard! 😉