Well, we are not competitors, we target different markets. Next is infinitely extensible, Qutebrowser is not. Also Qutebrowser is married to QT, Next is not. If we wanted to, we could in about 1000 lines of code make a QT port for Next that uses Blink. Take a look at the platform ports https://github.com/atlas-engineer/next/tree/master/ports and you will see that they are quite trivial to implement :)