I went with the recommendation of Ken Rockwell who is both experienced and opinionated, and said to buy that one at the time. https://www.kenrockwell.com/tech/recommended-cameras.htm
He was right!
- small, especially if you put a 50mm prime lens on it (which costs ~ CAD 150 by the way)
- light
- full frame sensor (fundamentally better photo quality, but need bigger lenses to zoom)
- battery life is OK but not great. You can easily get through a full day of touristing with one spare battery though.
Personally, I use Sony APS-C the most because of its smaller size, lighter weight, and more affordable lenses. Among APS-C systems, Sony and Fuji offer the widest lens selection. Fuji gear tends to be overpriced now, but it does have a stylish look.
Micro Four Thirds lenses are usually cheaper and more lightweight.
If you're shooting fast-moving subjects like birds or Formula 1 racing, Canon and Nikon are the most popular choices. They offer a wide range high performance lenses designed for demanding situations.