Really depends on how long Booker is out. Phoenix should still win this series, even if Booker doesn't return, but if he's out a prolonged time, or hobbled by a consistent hamstring issue, it could prove pretty devastating.
The thing is, the Suns are on borrowed time and really, their title hopes are tied to whether Paul can keep this play up another year or so. If he can't or he retires, they'll still be very good but I'm not sure they'll be good enough.
So, knowing that, it's a big deal for the Suns only because if they don't win it this year, are they actually going to be better next year with an aging Paul? Maybe - they did win a lot with him out this season. But still, it's a huge unknown.
With the Jazz, not much is expected of them...even if they get by Dallas. This season they are not a real contender, imo, so losing this round, or next round, is kind of the expectation now.