If you cannot try the bikes out, you'll need to do a lot of online research. From what was stated before about type of touring, geography and your body build, will play big factors.
Surface: paved, gravel, off-road
Load: bike packing, rear rack, rear and front rack with panniers
Geography: N America, Europe, Australia or Africa, Asia, S America?
Terrain: Flat, hilly, mountainous-wet, dry, desert.
Answer these questions and that may help you narrow down your choices.
Let us know what you go with
Cheers