My favourite tyre for touring with luggage or local utility use (both mainly on roads) is the 2" (50 x 559) Supreme, which I currently have on my Raven Tour touring bike and my "new" Raven Tour utility bike. 50 x 559 Supremes coped OK on my old bike riding with a touring load on the tracks in the photos, but I may have been lucky.
When first I got my "touring" Raven Tour I started with 2" (50 x 559) Duremes. IMO these tyres are well suited for a mix of road and unsurfaced tracks, tougher than the Supremes but with slightly more rolling resistance on good surfaces. I haven't used them much for touring, but have used them extensively for survey work involving a lot of riding on paths and tracks, they are now on one of my visitor bikes that gets used frequently for mild off-road rides. I'd put Duremes back on my tourer if I ever planned to use it extensively off tarmac roads.
On my old utility bike with 650B rims I noticed a significant increase in comfort, durability and a decrease in rolling resistance when going from old 44X584 Michelin tyres to modern 44X584 Schwalbe Marathons. With the revival in 650B tyres I then changed to 42X584 Schwalbe Supremes, which gave a further increase in comfort together with a decrease in rolling resistance, but probably at the expense of durability. Finally, after passing the 42x584 Supremes on to my wife's old bike, I changed to 50x584 Supremes, even more comfort, but perhaps a very slight increase in rolling resistance over the 42x584. With the 50x584 Supremes performance on sandy tracks was noticeably better than with any of the smaller section tyres.