Although full-frame DSLRs from Canon and Nikon are still the most versatile cameras for the widest range of shooting subjects and have the biggest systems, I'm not at all sure I'd get started with them today. I use my Fujifilm mirrorless far more because it's far more packable and it's at least "good enough" for most purposes. (And, to be honest, I spend more time shooting with my iPhone than either.)