Don't want to sound mean, but your question is so very personal, kinda like asking what color car do you think I should buy? It's your money, and you don't say if you're wealthy or on a super tight budget because you were recently laid off. You have two options, buy new or buy used. If I buy used, I inspect the equipment carefully and run a compression test, look at the oil, see if the machine looks well maintained, ask questions and turn your BS detector up to High.Looking for a XT2 42" LX. New is going to be about $3400 out the door. Found what appears to he a very nice used one with 96 hours on it. Cost is $2000.
I know there will be no warranty on the used mower. I am fairly handy but not a mechanic. I really liked my local dealer when I went to look at the new ones. I am cutting a flat half acre. The machine will see about 30-ish hours a year. Just kind of torn if having a spanking new machine with 3 year warranty is worth $1400 to me and looking for opinions from others as to which they would choose and why.
I like buying from private parties, there more room to negotiate, and you're not helping someone pay their overhead. Personally I prefer to buy new when on sale after researching thoroughly and maintain it well, I mean REALLY well. I do all my own work so I know it's done right. I am still using my 1969 Craftsman 20" rotary walk behind for trimming my lawn. 56 years of reliable service. Love it for the super light magnesium deck, hard to find these days. I replaced the engine 5 years ago after the compression fell below 25psi and it no longer fired. Got a free used engine off a mower whose steel deck had rusted out and the wheels were wobbly as hell. It's still a Tecumseh but about 25 yrs newer with electronic ignition which always starts first or second pull. In 1982 I bought a new Sears Craftsman 36" twin blade lawn tractor with a 10 hp Briggs engine. Still mowing with that after 42 years. Converted the points ignition to solid state for $35, super happy I did. BTW I have run full synthetic oil in both machines since 1990, it lubricates better than dino oil and can be run longer between changes. I change oil every third year. My lawn is only 0.4 acres so not too many hours. I'm sure some people will disagree with me but I'm very happy with the longevity of my equipment.