<< If you're going to buy an RV, is a pop-up trailer the way to go? >>
Depends.
1. Are you a seasoned camper, and have you used tents before?
2. Are you comfortable with towing anything behind your vehicle? If so, what's your size limit (height, length, width), both for your vehicle and for your own peace of mind?
3. Do you like cooking outside (over a fire or on a portable stove), or would you rather have all of your cooking activities done "indoors"?
4. Do you want/need privy facilities in your living quarters, or are you willing to walk down the road when nature calls?
5. How about heating and cooling? Are you comfortable with what Mom Nature provides (supplemented with blankets as needed) or do you prefer climate/temp control year-round?
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I am a fairly seasoned camper, having done everything from backpack canoe trips up north to 30' RVs with full hook-ups at fancy campgrounds (and everything in between).
Question 1 is important because a traditional pop-up camper is basically a tent on wheels. You're up off the ground, you may even have a hard top over the "move-around" area, but it's still just you and canvas (or nylon) between the great out-of-doors and you in your sleeping bag. And if you've ever spent a spring weekend camping anywhere except the Mojave Desert, you know that rain is part of the package; with rain comes soggy tents (and frequently soggy campers, if the waterproofing isn't quite up to snuff). If this does not sound like something you can handle, don't bother with a pop-up camper.
Question 2 will determine what (if anything) you can handle in equipment. My parents loved (and used) pop-ups and hard-shell trailer RVs (and, for the most part, always kept a vehicle that could handle the tow weight), and my Dad was fairly comfortable with the nuances of towing things (how to back up and park, how to handle unhitching, etc.). My in-laws, OTOH, couldn't stand to tow anything, so they opted for a self-contained RV (driver area in the front, rest is housing, all in one "box"😉. At one point, both sets of parents owned similar equipment, manufactured by the same company; Mom & Dad's was the tow-behind, in-laws was a big box.
Questions 3, 4, and 5 will tell you how much stuff you want to put in your box, whether pop-up, hard-shell, or self-contained. I will add here that I am not a proponent of heating and cooking equipment (anything with a flame) in canvas/nylon units - I've seen a couple of fires caused by things getting knocked over, and they are not pretty. Most hard-shell and self-contained units have permanently mounted equipment, which is far safer and made for travel.
If you have the opportunity, visit a couple of travel and recreation shows and look at all of the possibilities. In larger areas, you can often rent both RVs and camping trailers (both kinds), and this is also a good way to test your comfort level with them.
Lady Niniane