I can't say I've done both, I've only towed four down, but I think I can give a view on what I see as the pros and cons. Towing 4 down requires a car that is capable being towed, adding base plate equipment, lighting, brakes and tow bar (between $1000. - $2000 for equipment). It can't be backed up (some will for a few feet in an emergency) without disconnecting. Once the above has been purchased, connecting and disconnecting a towed can be done in just a few minutes. Typically, when we arrive at a campground, my wife checks in while I disconnect the towed in the registration lane. By the time she's registered, we're ready to head to our sight.
We travel all over the southwest and I rarely see RVer's towing cars on trailers. When I do, it's often something that they don't want on the ground, like an older hot rod. I'm guessing you probably could buy a good used trailer for about the same price as the tow equipment for four down towing. You can also backup a trailer without any issues. Those are the pros, but I see many more cons that are hard to overcome. Both when camping and at home, you have to have a place to store the trailer. I know many will say that they just get pull thru sites, but that really limits you as to where you can camp.
When arriving at a campground, without a pull through spot, you'll need a place where you can off load the car, while the trailer is still attached to the RV and then figure out where you can park the trailer if it won't fit in the site (typically won't because you also have a car to park). Lastly, it's just more work, not only do you have to attach the trailer to the coach, along with chains and wiring, like a tow bar, but now you have manipulate heavy ramps to load the car and crawl around the trailer and strap the car down.
I see that you're driving a short coach and intend on towing/trailering a small car. I would just tow it four down. You won't be that long and will easily be able to negotiate fuel stops. We're a 40' coach towing a Chevrolet Silverado 4 door, with an overall length of 65'. I rarely use the big truck stops for fuel because their prices are so much higher. In this day and age, there are very few gas stations we can't get into.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab