When I say Phoenix is the best team, I mean in terms of playing together/chemistry and everybody knowing their roles while having multiple ways to get a W.
Milwaukee clearly has the most dominant player -- as in, no matter what, he's getting his and it can be argued that as a collective, the Bucks' best 5 are more talented than the Suns' best 5. However, the Bucks are prone to doing dumb shyt and going away from what's working offensively. Phoenix doesn't do that as often when they can help it.
Phoenix will still win the series IMO, but that's mostly because their backcourt seems much more consistent than Milwaukee's (though the Bucks' backcourt is probably more talented) and coaching-wise I'll take Monty over Bud in a six or seven-game series where adjustments are going to need to be made.
The Bucks won by 20 but at one point in the third quarter, the Suns had cut a 15-point deficit down to 4 before it got away from them. And this is with Ayton in foul trouble, Booker having his worst playoff game ever (one of his worst, period) and Jae Crowder looking like the team's best player far too much. So far, both teams have done what is expected: win at home.