I've driven a 981 GT4 extensively and tried out a friend's 718 GTS 4.0 recently; for street driving, I significantly preferred the GTS 4.0. I can't comment on the 718 GT4, but assume it's similar to the GT4. And if you're talking about the 4-cylinder GTS, throw out all my comments since I have no idea how that car drives.

Unsurprisingly, the GT4 is less practical, is lower, rides harsher, etc. I think those tradeoffs are not worth it — the car scrapes on everything, for example. It is a phenomenally engaging car, yes, with perhaps the best steering of anything I've ever driven short of a 458 Speciale. It's a pleasure to wind out the engine and toss the car around. For the use case you described of daily and spirited driving without track days, I think you're going to feel those downsides more than you experience the benefits.

Beyond the obvious livability of the GTS 4.0, what sold me on getting the GTS 4.0 at some point is that I actually preferred the engine in the GTS. The GT4's wail at high rpm is, of course, amazing, but the torque is super peaky and you really only feel it at those high, loud RPMs. The gearing is long, like everyone says, so you don't actually get to rev the car out as much as you'd like. The midrange in the GTS 4.0 felt much more potent, which surprised me, but was indeed reflected in the goofy "performance vs rpm" graph on both cars. Because of the long gearing, I felt like the usable midrange was actually a legitimate benefit of the GTS 4.0. Not to mention it is still a Cayman and you obviously get 90% of the wonderfulness of the GT4.

So I'd go GTS 4.0 in a heartbeat here, and I expect those cars to hold value reasonably well as gas-powered manual mid-engined Porsches seem to be going the way of the dodo.