I can vouch for Casper original, as I’ve slept on that bed for 5+ years and we just moved it into the travel trailer as we upgrade to a larger bed. The new Casper original is upgraded versus what I have, but we have laid on it and would buy the current version. We put a mattress breather thing under it in the trailer.
I am currently sleeping on a Tuft and Needle original destined to become our guest bed. Very happy with it as well. I read reviews that said >200lbs would find this particular bed too soft and would agree, but at 180lbs I love it and so does my (smaller) wife.
Both of these beds are on the medium to medium firm side, and neither has that sink-in feeling of, say, a tempur pedic. Depending on your preferences, that can be good or bad. For me it’s good and we sleep comfortably.
Between the two, I would buy the Casper again as my everyday bed, but would buy the T&N for a trailer in a heartbeat - it’s half the price and still very comfortable. One of the biggest plus factors for both is that they do not sleep hot - a lot of foam beds do in my experience. Both are very highly rated in numerous places. Some Macy’s have Casper in the store, some Lowe’s stores sell the T&N but don’t have a display, just the bed in a box.