Sony's DSLRs are much better than their point and shoots. Ever heard of Konica Minolta? That's the difference between their P&S and DSLRs.
Your best bet is as Mikesev has said. Go to the store and see how they feel in your hands. Make sure you like the controls on adjusting shutter speed, aperture, ISO, and other controls you feel you will use. The deciding factor for many is the availability of lenses. Canon and Nikon rule the roost for a reason, they have tons of easily accessible, quality glass.
Your best bet is as Mikesev has said. Go to the store and see how they feel in your hands. Make sure you like the controls on adjusting shutter speed, aperture, ISO, and other controls you feel you will use. The deciding factor for many is the availability of lenses. Canon and Nikon rule the roost for a reason, they have tons of easily accessible, quality glass.