You’ll likely learn much more in a couple of good private lessons than a week of ESF style ‘ski school’.
I’ve both skied and boarded a lot, there is no wrong decision. I tend to ski nowadays because it’s easier to see where you are going, but do what grabs your fancy.
If I was with a bunch of mates, I’d do whatever the majority is doing.
Also if you think you may one day want to do ski-touring, that’s much more viable than board-touring (because you can ski uphill but not board uphill), in which case pick skiing as you’re starting to build up the skillset.
By far the highest risk of injury is collision with other people on the slope, and it won’t be your fault as you’re a newbie, it’ll most likely be an out of control or inconsiderate other person. So go somewhere uncrowded.
Mid-march to mid-April is great in the alps, best time IMO.
Ignore any tour ops pumping or dissing resorts based upon early season snowfall, it’s bs they have no idea how the season’s going to pan out, it can change any time.