I have two QCX, one for 40m and one for 20m. They are both very good rigs and have a great performance on CW. The uBitX is also a capable performer once it has a decent CW filter fitted.
Which one do I prefer... difficult to say the QCX rigs are very, very good.
The uBitX has multi band coverage and when fitted with a Nextion display and CEC firmware is also a good rig. Recommendations... get both >:-) although I think you already have a QCX.
If you want a bit more RF then the QRP-Labs 50 watt amplifier is just the job. I can use mine with both my 40m QCX and also on 40m with my uBitX. Use either rig to drive the amp and, in my case, I use a 5 volt supply and a press switch to trigger the amp on Tx.