Squats can be done at any location and mild weather such as outdoors indoors etc.

Leg presses are bound to equipment I presume and you will have to prepare yourself to get there (gym, maybe traffic, family matters), be there (if machine is available, looking at the clock for time, etc) and get back (traffic, getting sleepy, etc) from there which can shave your joy in what you want to achieve.

Me neither I am no expert on these matters.