Krista in general the tidiest and tightest forms stay that way when dried. A lot of forms with long thin petals like cactus actually roll in when dried. Informal decorative, semi cactus and lacinated are the least predictable but in a good way! I've dried singles and collarettes and anemones too. I think anemones turn out the best.
Form aside, variegated, bicolor and multi color make the most interesting dried dahlias in my opinion.
Some varieties dry better than others and are just less fragile. Bloom attachment, like with fresh, is super important!
Honestly each one is kind of a little experiment and I think that is what I love so much. By tge way, the arrangement I made above for last Thanksgiving looks as perfect today. Zero fading or other issues!