I personally bought "New" and would never even think about buying "used" for my personal use. To fix up and sell....maybe. I dont like the smell of used RV's and LOVE the smell of a new one. It's all about preference. I also dont like the thought of buying "trouble". (And there's a considerable amount can be found AFTER you delve into a used RV!!) If there's never been water leaks
and/or mildew, then you may come out ahead. But I've found that seemingly most RV'ers (FG OR S&T) just let their campers sit without any thought of ventilation, cleaning, covering (protecting from UV rays) etc.
I've done a CONSIDERABLE amount of "mods" to mine. Some Scamp
SHOULD do and some I just wanted to do on my own for my personal touch. My mods were fun. I think taking a "gutted" Scamp
and building back the interior ("Deluxe" style) would be fun...but very time consuming.
Someone mentioned something VERY important.... how much time you want to invest in it vs how bad to you want to go camping. That will help determine the condition of the trailer you want to get if buying used.
The bottom line is, what ever makes YOU happy, do it. Then you wont regret your decision OR your money and time spent!