Well, Stevens is great but for beginners, except Mill Valley (sometimes it is open for skiers). Best access is, we know Summit. There is also a nice Summit learning center and with my respect to all another learning schools, they're doing a great job.
But you can see the best skiers on Alpental (Alpental At The Summit). The reason is simple; they know about skiing and slopes. There is only 5% beginner’s terrains so go to Summit West where there is 40% beginners or Central 25% beginners and in future come to Alpental if you are currently intermediate.
To ski on Alpental all winter you must love this mountain and explore more. This is the reason for other skiers to be jealous of Alpental.
Weather, what weather? Wet snow and rain, they are pretty much same.
And all are good, depending what you are looking for.