I would opt for 120gb today.
A SSd will slow down as it approaches full. you don't want that.
And... there is really a lot of writing to the ssd going on, and it is the small random read and write performance that you will notice. Do not worry about ssd endurance; it will be obsolete long before you run out of updates.
Modern ssd's all perform about the same.
I like Samsung and intel for reliability.