Although I use a bag once in awhile when I crave that full feeling and the somewhat helpless feeling of expelling, I much prefer a bulb with a large diameter nozzle.
I got frequent enemas in childhood in the diapering position from a young aunt who loved giving me enemas, particularly when she found that I loved them. She was very slow when she started--cooing playfully as she filled the bulb, moving the nozzle toward me, which I could see in anticipation between my legs, touch it to my bottom and wait, then I could feel it going in ever so slowly until the bulb was snuggled against my bottom. She got to stroking it in and out for awhile, and as the years progressed, I would get erections from the stroking, particularly when she had been giving me enemas with a douche nozzle. That's what has captivated me into aduldhood.
I crave feeling the nozzle stroking in and out of me even more than feeling the water filling me. I often put the nozzle in me with the weight of the full bulb as an "anchor" laying on the bed and hump back and forth as the nozzle titilates me to ecstacy. This why I prefer a bulb.
I have the good fortune of occasionally traveling to visit a friend who is quite knowledgeable in anal sensitivities. She takes up to a half hour to play with me anally, first playing a well lubed finger in and out of my bottom, then a couple fingers, then a jell dildo, then finally the nozzle of a bulb syringe, after which she squeezes the bulb. I enjoy the surge from bulb, which isn't evident with a bag. She taught me how to squeeze my anal sphincter as she moves her finger or the nozzle in and out of me.
All in all, I fell a bulb can be a better toy for those who are anally erotic.
I often wonder what others think about their preference for a bulb syringe.