Batteries should follow standards.
But the production doesn't.
Duracell used to have prismatic cells and therefore a slightly better capacity vs. volume. I do not know the exact situation at the moment.
There's quite a lot of difference between a manufacturer and another: size, capacity, how the chemistry follows the load etc. I would like to say that Duracell is very good, Varta, Renata, Panasonic, and many other known brands very good. But as battery industry is about large numbers, any brand has a failure every now and then. No name brands from Aldi/Lidl/Coop/Ikea may be good, or not. They may use some good source, but as China is usually involved there, I don't want to use their products.
Battery clips can be whatever. Sizes sure are not even close to standards, but up to manufacturers. Metal parts are usually quite soft, and contacts unreliable. Every time I change a battery, I check connections carefully.