The crinkle receive from the twists, are not that strong as when I do a braid out. Mind you, the below pictures are two days old compare to the top.
I do prefer doing braids for crinkles, but if I just washed my hair, and want to just have them up for the summer, the twists will do nicely due to the fact that I can get "neater" styles vs the braids out. An example of style created with the twists can be found here & here . I like both, and it really up to you on what you think fits your lifestyle better. Note: I have tried doing styles with the braids, but the style looks much better with twists (the twists gives an appearance of having thicker locks).