I have both a '22 5.0 F150 (lowered, tuned etc) and a '22 SPP.
We also have 4 kids and the SPP is the vehicle my wife drives the most. My truck is my daily driver and much less comfortable than the SPP since it's lowered with a loud exhaust, but it scratches my itch. When we go on Family hauls, trips, or run arounds we all cannot fit in the 5.0 so I drive the SPP.
Few things noteworthy as we've had a '20 Expedition as well.
1) Buy a Max edition. With all three rows up, you'll need the additional trunk space. Plus, shorties look disproportionate IMO.
2) Buy a Max with the 2nd row captains chairs. Having the bench is cool if you must have an 8 seater, but it's too much a hassle for young kids to fold/tilt the seats and slide them.
3) Power difference between the SPP and Stealth Edition is not going to blow you away. You also need to run 91 octane in the SPP to get the advertised power numbers.
The H/O ecoboost in the SPP is a good power plant, but so is the regular ecoboost. Both have plenty of power available and it's not as if the SPP is some sort of untamable beast, it just has a touch more jam when you lay into it.
As said above, try the CCD version and non CCD.
Our first Expy was CCD and the SPP now is not. At first, I preferred CCD but now I like the base suspension. Could it be because I've just gotten use to it? Maybe. But anything feels like a Cadillac compared to a lowered, solid rear axle pick up truck I drive.
You can get the Stealth Package without the extra price tag of the SPP as well, if it's mostly the appearance package you like.