Which is better baby carrier or stroller?

I'm posting as anonymous because I'm a little embarrassed. I don't have that much money right now and I can only buy one. I'm 20 weeks right now so I have a lot of time but I'm in nesting mode so I want to figure it out now. I like the idea of the baby carrier because it lets me be very close to my baby. Would using the baby carrier everyday be too much for me to handle? I'm not that strong so I'm worried about it giving me a backache. On the other hand I love that some strollers come with cup holders and child trays which would really come in handy. If I'm going to get a stroller I'm going to get a travel system. Can anyone please help me decide?