Portable scope for Planetary views?

I need some advice on my next telescope purchase. tl;dr at the end, but first context:

Current gear: I have a Heritage 150P, as well as a short 70mm achromat.

Since I hadn't gotten to actually owning a telescope at the last Mars opposition, and I know they'll be getting even less impressive for the next decade, so I want to upgrade to a scope that can provide a bit better planetary views than my current setup. I am well aware of the (justified) standard advice of getting a 8+ inch dob, but I want some advice tailored to my specific complications.

Portability is a bit of a challenge - *I don't have a car*. Most of my viewing is from my small town back yard (approx Bortle 6 and unavoidable stray lights killing dark adaption), but sometimes my dad joins me and my partner and we drive 30-40 minutes to a Bortle 3-ish location. However, we're three persons in a usually semi-cluttered sedan - there's not a huge amount of room and definitely not a full back seat free.

Tracking is a requirement - we are at least two persons taking turns looking, those swaps are rough enough at the powers we reach with the current 750 mm focal length. GoTo isn't a necessity, we're currently quite satisfied with the manual navigation, but tracking without GoTo seems fairly rare outside of EQ mounts.

Mostly I'm weighing between Celestron Nexstar 6SE or 8SE and Skywatcher Skyliner Flextube 8" or 10".

The dobs of course has the price and aperture advantages, but I worry about weight (for each part) and whether the tube actually collapses enough for our transportation needs. The SCTs seems at least more compact and lighter. It also very clearly fits with us all in the car, and can even be used without the tripod if there's a sturdy enough table to place the mount on so might even be possible to bring by bike in a large backpack.

So - anyone able to offer advice?

tl;dr - I want to get another scope, that 1) is good for planetary (and high power lunar) views. 2) tracks. 3) can be packed down into a *single* car seat and trunk. Which fits best: Nextar series SCT or Flextube GoTo dob?