I think it depends on what specific use case you want the camera for. I wanted a small carry-anywhere point and shoot (with some control) type camera and borrowed a Rollei 35 Sonnar, Olympus XA and XA2 from a friend.
The Sonnar was the hardest to use, followed by the XA (simple enough), and the XA2 was the most straightforward. The XA series' flash is also a nice thing to have.
The Rollei 35 is easily the better made camera—it's like a swiss watch.
Ultimately I decided to get an XA2. All three are great cameras, but the Rollei is a beast to focus and will likely involve a lot of hard work and time before you will get every shot correctly focused. That isn't a bad thing, but it was simply not suited for my needs.
Looking back, I think that the two cameras are so dissimilar that it's not really possible to compare them except for their size (Rollei is smaller but the XA is also very very small). You should decide based on your use case and needs.