I’ve found that the Roku Ultra (the box with the remote) tends to have fewer issues than the Roku Stick, especially when it comes to connectivity and performance. The Ultra also supports Ethernet for a more stable connection, and it’s generally faster. If you’re looking for better reliability and performance, the Roku Ultra might be a solid upgrade!
I think that kind of depends on your expectations of the device. The newer Ultras definitely have the bells and whistles that some of the other devices do not, but any of the newer devices operate basically on the same OS. So, the bugs/technical issues will be pretty similar across the board in terms of that. Any devices as they age, such as the older ones, will start having issues, especially if the OS(s) are older and can't be updated or have been discontinued, so you may see complaints about the sticks or boxes, but they may also be old devices that are no longer compatible, especially since Roku gives their different models similar names that make it harder to differentiate what model someone means.
