Is it ok to use a sleeping bag for newborn? Or swaddle is ok?

There are sleeping bags for newborns between 0 to 6 months but I prefer swaddling as it makes them feel snug and secure. Sleeping bags have free space for their legs to move around and newborns may be startled awake by their Moro reflex. I used the Aden and Anais muslin swaddles as well as SwaddleMe swaddles which were easy to put on. Now that she's a lot bigger, she doesn't need to be swaddled and sleeps with a blanket. She doesn't wear sleeping bags anymore either. http://sg.theasianparent.com/white-noise-and-swaddling-gro-hush-gro-snug/3/