Prague to Vienna by train

Hi ,

Planning a trip in June and will travel from Prague to vienna by train. I just spotted a €14.30 fare on the ÖBB site for the direct Railjet (RJ 55). Including seat reservations, it’s coming to about €37.60 for 2 adults and a child. while Regiojet is showing €64 for 2nd class comfort option for next month, they are yet to open for June

I was originally going to wait for RegioJet to open their June bookings, but this ÖBB price seems hard to beat.

Looking for some quick advice:

• Is the 2nd class on the ÖBB Railjet comfortable ?
• I'm worried about luggage—is there a specific carriage in the Railjet that has better racks?
• Is it better to book this on the ČD (Czech Railways) site or stick with ÖBB? (I've heard ČD can be cheaper sometimes but currently obb is giving this discount only for 2nd class).

Thanks for the help!