The bottom line is whether they break. If you want to look at real expert opinion, then you run also into guys who prefer straight (Beckman), or alternatively will tell you their spokes have gone 300 000 miles (Brandt), or they built a bomber touring wheel with only 20 spokes (Shaneker). With properly built wheels with enough spokes, and only traveling a few hundred thousand miles, it doesn't mater. The are probably 30 more important decisions when building a wheel than which type of spoke you use, straight or butted. Badly built wheels break spokes, and bad rims break spokes, or break themselves. Spokes are virtually eternal. If you want to spend more money or time. check every spoke for tension either by tone or with a meter. Be sure to build to correct tension. Or use a shop with serious touring experience.
My observation is that people with butted spokes talk a lot about spoke breakage, and people with straight spokes don't. I have never broken a straight spoke.