Q Light Controller+

I'm considering to buy a new RPi to replace my old RPi model B revision 2.0, for a future use it with QLC+. What RPi version do you recommend RPi2 or RPi3?.

I use the RPi3 for QLC+ and it is great. It works also as accesspoint to control the light from my tablet.

I'd suggest a PI3 as well.
Despite some UART/Bluetooth issues you might encounter, the CPU power allows QLC+ to run good and the WiFi interface is a plus.
Minor note: beware of heating problems. If you intend to use it intensively, in hot places or enclosed in a box, you might want to consider a heat sink over the BCM chip.

Many thanks!.
I find a heat sink at Amazon is this: https://www.amazon.es/gp/product/B01FY9 ... 30HX3V5D9G
And the Raspberry Pi 3 Official Desktop Starter Bundle (16GB, Black)

This summer I ran the shows with Raspberry Pi 3. The occasional flicker of the dimmer pack was completely gone. So personally I stick with Pi3 from now on. As I use the UART for controlling DMX the trick is to add this line to /boot/config.txt

dtoverlay=pi3-miniuart-bt

It puts the good UART ttyAMA0 back to the old pins like on the Pi2 and puts bluetooth on the crappy miniuart ttyS0.