Replying to 4 - 6 day Austrian Ski Trip - Suggestions

My friend and I are planning a 4 - 6 day ski trip in Austria for the end of February. We are likely going to start in Munich then train down to Innsbruck. I know there tons of resorts in that area but any suggestions for the best one or one to use as a "base" would be much appreciated.

Public transport an option? Should we rent a car and go from resort to resort?

We (our knees) don't care about park skiing.

Thanks!