SINCE YOU ASKED: the following is my opinion.

Let me say first that I am mainly a Nikon shooter, but own and use Nikon, Canon, and Sony cameras and lenses. Here is a very concise and short view.

Nikon: very user friendly. Great image quality. Lenses can be priced higher than most others for same specs. Many accessories and even cameras can be in short supply at times. New flagship definitely overpriced.

Canon: ruled the pro world at one time. Losing ground currently. Name hurt a lot by recent snafu's in new offerings. Lenses are more competitively priced than Nikon as a general rule, {pro lenses}. Canon has recently undergone a price increase on lenses so this may not be true now.

Sony: new kid on the block. many, many old Minolta lenses available at good prices, some give stellar results. Only DSLR currently offering Zeiss lenses that auto focus. Flagship affordably priced. Very convenient one switch live view mode on some models. Excellent image quality, equaling the other two in my opinion. Pro lens offering scant at the present time, but Sony seems to be working on that diligently.

If I had to start all over knowing what I know now??? Why that'd be Sony.