We bought a three year old unit because we found the floor plan we like at a price we could afford. It was lightly used.
The most important thing we did was rent a similar sized TT first. 10 day in the Ozarks from IN and we learned a lot about towing, parking, floor plan and RVing in general.
The biggest lesson was, although my F-150 had the cargo capacity for the tongue weight of a loaded 25 ft. TT; the 200 hp. motor which hauled our pop-up all over the country could not cut it. We upgraded to a 356 hp. E-boost F-150.
As mentioned, new or used it is best to be handy with service work. I believe there is more service work on an RV then most beginners realize. This of course assumes a fair amount of use.
Finally, check the cargo capacity of your Tow vehicle. Family, camp gear and toys eat a lot of it up; before you add the tongue weight of a loaded TT. It is often twice the advertised dry tongue weight.
Good luck and remember it is not a race.