betaseron or rebif

Help please. My neuro has told me my only options for treatment at this point is rebif or betaseron. I have a very complicated medical history so only these two will work for me right now. I hate needles! I take them several times a month for other medical issues and taking them every two or 3 days in addition has me literally sick to my stomach. I'm getting behind on my MS treatment because I can't bring myself to make a decision between the two. Any suggestions?