Strava says I have 15k miles on my current recumbent. The previous one probably had more but I didn't have Strava back then. Longest single day ride was 400 miles, and longest event was over 900 miles.

I also have an upright MTB, rando bike, commuter, and (as of today) a CX bike.

Longest single ride on an upright would be 400k/260 miles, and longest event 600k/370 miles.

For comfort, the 'bent is untouchable. True story: on a 1000k brevet, we stopped for a quick nap. The upright guys lay down on the wet grass, while I stayed clipped in, leaned against the fire station, and had a good snooze - because my 'bent seat was the most comfortable thing around even after a few hundred miles.

For speed on the flats and downhills, solo, the 'bent is also untouchable. No contest.

For climbs, anything above 2% the upright reigns. The steeper the grade, the bigger the difference. I don't know why. Don't care. It just is.

For group riding, upright is the way to go. The 'bent sucks in groups, particularly if there is any terrain. I've ridden two 1000ks with groups, in terrain, and it's a pain. I killed myself to stay with them climbing, rode the brakes descending, and loafed on the flats. The draft behind me is sub-par, and I can't see my front wheel well enough to draft closely.

For fun? Just plain enjoyment of riding a bicycle? Upright. I don't know what the magic is that comes with a lively upright, but there's nothing like it.

I find recumbent evangelizing to be silly, and people who'd rather be shot than ride one to be equally silly. If I had the dollars and space, I'd have a velomobile, FWD 'bent, carbon road bike, fixie, SS, tandem, and a 36" unicycle. It's all good.