So this is one of those things that will vary a lot between specific player preferences. I was actually surprised how evenly split this poll was. If I was to have the choice though, I would rather less attention on the leveling process as we tend to take care of leveling in a number of hours compared to sitting at max level. This is the first time we get a dedicated max level at the start of an xpac ever and I think that is pretty cool.
The bottom line is that there will always be a finite amount of content that they can ever deliver. And if I had the choice of an amazing and varied leveling experience or amazing and varied max level content, max level content wins every time. WoD is a perfect example of this, I think it may very well have been one of the hands down most fun experiences I have ever had leveling. But I think a lot of people will agree was probably the weakest xpac as a whole we have had.
To be clear I like the leveling process and if they could release Legion with 12 zones in the same amount of time, more power to them. But in todays wow this just isn't realistic so I am happy where they are putting their efforts.
P.S. Suramar is looking like an incredible zone and from what I have seen of Alpha is actually a lot of zones into one as far as effort put into completing the content. Preach released a video today going over Suramar, and he talks about the enormity of this zone that is possibly relevant at max level for a much grander amount of time than the leveling process.
*POSSIBLE SPOILERS*
I'm excited