Generators are generally heavy and bulky, even portable generators for camping. Especially those that require fuel. A midrange generator can weigh upwards of 100 lbs. While the heavy-duty ones can go up to 300 lbs. That can be a real struggle to manoeuvre around, especially when you are alone.
Not only that, by occupying a lot of space and weight, it's limiting a lot of things you can bring along to your boondocking trip. Therefore, ideally you should get as light as you can.
But, small and light generators produce lower wattage. So, you need to find the ideal balance between your power requirement and the generator size.