I remember looking at the Pathfinder Unchained Rogue and wondering why Paizo was going through such hoops to let that rogue version use Dex to attack and damage, when it hit me, that they were doing their darnedest to try to make it hard to get Dex to attack and damage with a quick level dip. 4e (and PF2)-style multiclassing avoids that completely. But that style you're not mixing your classes nearly as much; you're dipping a little, mostly for feat and paragon path access.

Personally, I prefer the 4e-style multiclassing, I never particularly cared about trying to mix classes up to make some concept work, and even then you could wind up with 1/2 to 1/3 of your stuff from the other class, depending (in 4e). But you can realize builds with an a la carte class/level system that you would need a full class for otherwise, so as long as it floats your boat, go for it.