Our camping clan is mixed with campers from pop ups to class A motor homes. Their are pros and cons with each one. I think there are a few questions you have to ask your self.
1) Are you sit at a site and just relax or do you like to travel around area and see the sites
2) Set up time. You have more set up time with a pop up. Limited storage space when compared to a camper. So you pack more stuff in your vehicle
3) Kids or grand kids. They want to have their kayaks, bikes, corn hole, this and that.....which all take up space.
For my pros and cons.
Anything over 30' could limit the number of spots at a campsite.
Water is your enemy. If buying used, lean heavily to any RV that has been stored under a roof
Most motorhomes and 5th wheels have steps inside. Major consideration for me. (bad knees)
Make sure your tow vehicle can pull what ever you buy SAFELY.
RVs do not hold their value. Never buy new.
Motorhomes.
Used coaches can be a great value and normally very low miles. If you tow a car behind a motorhome, you can never back up without disconnecting. Everyone I know who has bought a gas coach have wished by bought diesel. If you want to site see, you have to pack up, disconnect, fight city traffic in a land yacht if you dont have friends with a car to mooch a ride with or a tow vehicle. My FIL has a coach and he and his GF have to cram into our F450 (I am a family of 4) to go anywhere we go. He does mount a moped on the back of his RV for ice or milk runs. They normally just sit at camp sites and dont site see much. Maintenance is very high, but you camp a lot, long distances, it is a great ride. Class B or C is no different than a large truck so maintenance isnt as bad, but the ride isnt as nice/plush as class A.
5th Wheel.
Stairs inside to get the bathroom and master bedroom or in the newest designs, kitchen, is a downside. However, the ability of a king bed is very nice. They are normally 2-3' taller than a bumper pull which limits covered storage options (the reason I dont have a 5th wheel). They handle much better than bumper pulls, usually 2-3K pounds heavier, and require a bigger tow vehicle than bumper pulls. The toy hauler option is totally awesome and my dream is the XLR Thunderbolt. Toy Hauler also are great for bicycles, kayaks, fishing stuff and not just toys. Plus the back area can be converted to bunk beds and we normally have 2-3 middle school boys with us and hard to damage the hauler section vs the fancy living area. Biggest plus is you have your tow vehicle to site see. We like to site see a lot so this is a must for us. You are usually in pulling with a dully and that can be an issue (not huge IMO) on some parking at restaurants, and small parking lots. The public beach parking for example sucks for parking a dully. If you live on a side of a large hill and introduce different angles to park from your driveway, the king pin doesnt flex like a bumper mount. Tremendous stresses are applied and basically over time the camper integrity takes a toll.
Bumper pull
This segment is huge. You can go from mild to wild. If you have a tow vehicle already then match to a camper you like and enjoy the US. If you dont, find your dream camper, then buy a vehicle to pull it. It is very rare to find a king size bed, and most are limited to 30A. So max will be two air conditioners. If you go over 35' in length cooling can be tough. This is what we have and very happy with it.
Pup ups
We had one for 4-5 years. Served us well, but the set up time, and difficulty to keep the interior temperature regulated where a huge downer. Plus the ladies wanted a bathroom with a door vs a toilet out in the open. Had to kick every one out to poop or pee. You have a very small refrigerator so you have to haul a cooler.....need ice regulatory. This goes back to the set up and hauling stuff in your tow vehicle. Great for boon docking. If you have limited tow vehicle budget and have to use a SUV than a pop up isnt a bad option, just limited IMO.
Things I have learned what ever you choose.
1) Give your self some room on tow weight and vehicle tow capability. The trip is suppose to be fun, fighting a camper in cross winds or 18 wheeler passing the hole time has to be exhausting. My BIL pulls a 30' camper with a ram 1500. IDOT
2) May sure you have a air vent AND furnace vent in the bedroom.
3) Most will be, but a refrigerator that can run of electricity and propane is nice. Propane to keep the frig cold while driving is nice
4) The only brand of sewage hose to buy is Rino Flex. Those feliable water hoses are the bomb for water hook up. Take no room too.
5) If tandem axle, BAL X-Chock Tire Locking Chock is a must
6) Phone GPS are not for RVers. Buy a specific RV GPS. Ebay has used ones for under $100
7) Your 1st couple of trips camp near the house and/or a Walmart. You will forget stuff and realize you need XYZ.
8) All camper mattresses suck. Be prepared to upgrade or by a foam topper.
9) If DOA is over 6' lay in the bed before you buy......ask me how I know this. I am 6'1" and my feet hit the wall in our current camper

10) You need to have a 50A or 30A extension cord, and 20' of sewage house, and at least 20' water house. RV parks are designed by pissed of golf course designers. Hooks are all over the place.
Hope this helps.