I came to Zillertal (valley) on Boxing day and have stayed until mid-March snowboarding in about 7 of the areas. It was a late start with only one dump of snow 15/16 December and at least 3 weeks to the next. This meant reliance on snow making and stretching out what was available. But the resorts know how to and there was plenty of piste. In total, I was at Zillertal arena for around 50 days.
I snowboard, so am less demanding if it gets slushy. But the varied terrain means you can often find somewhere not hit by morning sun that is still skiable most times and not thrashed out. Steeper reds can get mogulled, the blacks (those few there are) can get pushed off and rutted.
Lifts are pretty modern at least by NZ standards. Few queues. 2 gondolas take you up to the field and the red buses are very regular. Get off the second gondy where there's fewer queues in the morning and it gets you straight up to red or blue pistes.
Cafes are much of a muchness. Some don't take visa. All nicely put together. Some have wifi. Plenty of wifi scattered about at lift stations.
Off-piste there are options, but doesn't last long. You want to get on it as soon as there's vis. Tree skiing possible but gnarly, more open terrain.
Of the Ziller resorts my favs were Zillertal, Kaltenbach, and Mayr. Glacier was worth a look especially is snow depleted, but others have more and more terrain and better cafes.
We spent a winter in Zell & skied most of the areas in Zillertal - all close & served by buses & a cute train - our season passes included all the areas (15?) in the valley as well as the train. We lived pretty much at the foot of Kreuzjoch, the hill behind Zell am Ziller town & it was a cool place, 2 sides to the mountain, the south facing towards Gerlostein was spring snow early in Feb. Nice cafes, lifts were a bit old but who cares... some days were powder, not that many trees to ski in but good slopes, bit autobahny here & there, particularly if a big crowd was there. Most of the time we had no full days, just cruisy. They used to put out a few training gates, probably for local teams but they never minded us using them, as long as we replaced any knockouts. Beware 2pm on, the kids get out of school & invade & they are not partial to queuing & waiting their turn... plenty of other mountains to try nearby, skiers mostly local, German & Dutch. Kiwis & Australians were very thin on the ground, local villagers don't speak English, this resort is not on the usual English speaking circuit (which is why we went there!). Easter was a blast - church in the morning, then a bierhaus oompahpah session, then skiing - everyone was drunk & skied like demons. Nobody died. Weather was a bit Euro, some great days & then fog, then back to clear skies, bit of a cycle. Score out of 10? 8.5. Enjoy.