I prefer to stick to RPi as it has far superior software support than many other similar alternatives. There are more powerful and more feature rich products already available on the market, however they are often hard just to get them to work because the software support is still lacking.
Another important thing that makes Raspberry Pi more attractive is the really good price/performance ratio it offers. Usually slightly more powerful or with just a few extra features boards may cost twice or even more compared to a RPi.
So RPi 3 is still the best choice for me personally and I have been using RPi since the fist model came out... :)