Personally I am very happy with the E8000, as I have said before its how the bike handles and rides that is most important to me, the only thing I really care about at this moment in time is the ability to run different size batteries depending on what ride I am doing, and luckily for me they have covered that with the new 630wh external battery. All these motors get you uphill in the way you want, and as long as the software doesn't make it ride horribly they are fit for purpose.
Whilst having more power is always nice, I never use boost, always just stick the bike in trail and go ride, and I cant say that I have ever been in a situation where I though "if only the bike had a bit more grunt..."
Really the software the motors run is far more important to the user experience, and how the power is delivered, I happen to like the way the e8000 delivers its power in what is a relatively subtle way compared to some of the other motors, but at the end of the day I would always choose a bike based off how it rides rather than the motor in it.
Thats why if I was in the market for a bike right now, despite my presence for the Shimano system, I would go for the Whyte e160 with the Bosch, simply because of all the new bikes I have tried it was the most fun. Luckily for my bank balance it wasn't any more fun than my Vitus!