there's no doubt about this! you should start with the DSLR! you've got total control over your photo with this!
why DSLR:
- interchangeable lenses(wide, ultra-wide, tele, super-tele, all around, prime, very fast lenses, macro, tilt & shift, lensbaby) ;
- larger sensor;
- great ISO sensitivity;
- better quality pictures;
- total control (you get exactly what you want!);
- Bulb function...


