I started out with a borrowed 5th wheel behind my F350. It wasn't terrible but when you got where you were going you were stuck driving the tow vehicle everywhere. Going to the track required either driving the race car or another tow rig. The setup time for this was about 30 minutes.
Next up was an Alaskan slide-in camper. It worked fairly well. You could tow to the track with it but if you were just camping, you would have to drive the camper everywhere. We drove this setup a lot, including a trip around Lake Superior. It works best when you are only staying one night at a campground before moving on to the next one. You were pretty limited for space as well. This one had very little space. No shower and no privacy. It was basically a bed with a dinette. The setup time for this was about 45 minutes.
In the interest of comfort and being able to tow different vehicles depending on what we were doing I bought a 1996 Class A Tiffin on the F53 chassis for $4500. It was almost the perfect rig. 8k towing capacity meant it would haul what I needed. Lots of track events, lots of camping. It was a bit of a fuel hog at 6 mpg, so it mostly stayed within 5 hours of home. It was a great rig with a few shortcomings. Mostly the lack of storage, the small bathroom and shower, and the short queen bed. This rig has hydraulic levelers. Setup time was about 15 minutes.
Taking everything I learned from the previous motorhome and RVs, I replaced the Tiffin this year with another class A. This time a 2007 Holiday Rambler on a Roadmaster chassis. It has 3 slides, including a super slide that is the entire driver's side. With a 10k towing capacity, it will haul everything I need it to. It's comfortable, has massive underbody storage, and drives extremely well, even towing. This rig is a diesel pusher with the 400 hp Cummins. It's old enough to be pre emissions so no DEF fluid or DPF to deal with. It was a good bit more than the Tiffin but it's at least that much better of a machine.
If you are going to spend months at a time living in it, pay particular attention to the living space and storage. If it's not a comfortable place to live, you will find yourself leaving it at home. Lay on the bed. Stand in the shower. Sit on the toilet. Do all of the things you would do at home. Buy the space and layout first. Then move on to the chassis.
TT or Class A is a personal choice. I stayed with the Class A because I didn't want to be limited to driving a truck or SUV all the time. I wanted to be able to haul a race car, or a car and boat on a stacked trailer. That's not possible with a TT.
Pay close attention to the condition of the roof on older units. They frequently leak. Any evidence of water intrusion needs to be inspected closely. Many of the inexpensive TTs and motorhomes are stick-built and rot quickly when water gets to them. Some of the better brands will have aluminum or steel framing. Do your research.
I would also consider staying with pre-COVID built units. There has been a lot of chatter about poor quality control during the COVID years. Manufacturers were building them as fast as they could without much regard for quality control.
Good luck with your search. Make sure you let us know what you ended up doing.