It makes sense that your friends have been split 50/50, since both a Eurail Youth pass and a Vorteilscard have advantages and both work fully with the OBB. Eurail also works with WestBahn. The Vorteilscard gives you 45-50% off Austrian tickets and 25% off in neighboring countries, although I'm surprised to see that the RailPlus list does not include France; they did participate a few years back. The Vorteilscard is a small up-front purchase, but you continue to pay most costs as you go. A Eurail pass is a bigger purchase to cover trips you're confident you will take. The more clear your trip plan, the easier it is to compare options.
For instance, is there a break period where you'll travel more by train? Will you travel outside the country every weekend? If you're there longer than the 2-month duration of most passes, can you concentrate on shorter trips for a period before activating the pass?
Since the Select pass only covers 2 - 4 countries, the 28-country Global pass is your more likely choice (and happens to be one of the few passes that covers Poland). A common choice would be a pass for 10 travel days within 2 months, which could cover 5 weekend roundtrips for $510, or 15 days for $670. I do expect to see some special offers in the next month or two. The European East pass (not a Eurail product) is well priced for travel in that direction, but that doesn't sound like your main focus. See our Austria rail page.
You're in a location where you can catch overnight trains to Italy, northern Germany, Zurich, Budapest, or Krakow; sometimes with one connection. If you're using a flexi style of Eurail pass, try to board the actual overnight train first and make any necessary connections the following morning, so that you only use one counted travel day. (See also Using Your Pass.)
You should also consider if there are some routes that you'll fly. Search for budget airlines at www.skyscanner.com.