As far as mouse types go you tend to find 2 different styles (lets ignore wired mice for now which are the spawn of the devil).
There are notebook mice. These tend to be small, making them uncomfortable for me to use. The big benefit with notebook mice though is that they can come with ultra-small USB dongles, or even better, bluetooth connectivity.
Then there are desktop mice. These are larger, ergonomically designed, with more buttons and all around nicer to use. However the USB dongles you get for them are generally a minimum of an inch long.
My problem is that I use a laptop all the time, I travel with it frequently and I like keeping the same mouse with me that is setup the way I like it. But the notebook mice are too small to use and the dongles with the desktop mice stick out too far which makes them very inconvenient.
What I really want is a desktop sized comfortable mouse that connects over bluetooth (I’d accept a sub-1cm USB dongle but really that just loses me a port). I’ve never found one, do they exist?