Concur with the rest suggesting triple. My current main bike is multi-purpose with emphasis on long rides: touring, randonneuring and some gravel grinding. I dislike having to switch cranksets for special events: loaded touring or very hilly terrain. So, I'm running a triple simply because of the wide range such crankset gives on any kind of terrain, gradient or carrying load. The issue I've found with doubles is that they run either too high or too low. I'm using a Shimano MTB crankset 22/36/48 and 11-34 cassette and never feel the need to have any higher or lower gear ratio. Works well on non-competitive Sunday group rides or loaded touring anywhere. BTW, the Sugino crankset mentioned above is an excellent recommendation.

If this is a new build for you (N+1) for touring (non-competitive purposes) in mind and based on your geographical location, my advice is "do not compromise." Build it appropriately geared from the get-go.