Both have it, at least speaking of DSRL models for beginners, my personal experience is that comparing a Canon T3i with a Sony NEX, the clarity in the image is taken by Sony, but the way it captures the colours I think the Canon wins the Sony, of course, this can be moved in the Post-Production, but the clarity is or is not, of course, open people who say, I give more “sharpening”, and already but just the Image information is not there.
Parameter Control: (Speed, Aperture, ISO, P, Auto, etc.)
Only because of the smaller size of the MirrorLess cameras, it is difficult for manufacturers to add similar control capability to that of a DSRL, but there are some brands that try it, and others like Sony (NEX) use programmable buttons with multifunctions, which It sometimes requires several clicks to achieve what with a single button in most of the DSRL.
Well here it seems that the DSRL with regard to photos have the advantage, my experience with a Canon Rebel T3i (DSRL) is that I can achieve better approaches even in low or low light situations, where the mirrorless ( I have a NEX-F3) struggle to focus and sometimes it takes away shots that require quick execution in low light conditions.
The DSRL have a wide selection of lenses, but the mirrorless to be of recent commercialization their options are more limited (in the present), although almost all brands offer adapters to put the lenses of their DSRL cameras (Adapter somewhat expensive because they provide control Focus, Aperture, etc.) or have the option to use lenses from other brands but this has its limitations as the camera does not control the focus and it is required to handle everything or almost everything in manual mode.
Practical and easy to load:
Well, there is no doubt that size is a big difference because the DSRL uses mechanisms that use mirrors and lenses to pass the image that the lens picks up to the viewfinder that usually is optical, so what the lens sees is what you see You, and therefore the space required for that makes this type of cameras are bulky, what they do in the mirrorless is that the lens goes directly to the image sensor and from there to an LCD viewfinder and/or LCD screen in the back of the camera achieving this eliminates the need for all that mechanism, which is why the size is much smaller.
In this area the two types have autofocus problems, but there are certain brands that have achieved a quite acceptable speed, for example, the Olympus, I with the Canon T3i and the Sony NEX-F3, I have experienced a low rate of AF (Autofocus), Apart from the fact that the camera is making attempts to adjust the focus and all that is taken around 10 to 15 seconds, Sony is a little faster, but when you want to make a shot and time the camera is taking, and for when focused, you possibly missed the critical moment of the scene, the mud of a cake, the kiss of the bride and groom or things like that. My daughter would tell me “I use all that in manual”.