I know there are a ton of variables here - so impossible to answer with 100% accuracy - but that doesn't mean the general concept can't be addressed.
Reason I'm asking: I have very uneven and hilly terrain. I have to be super careful when handling heavy loads. I would like a little bigger tractor, as I know that would increase my margin for error. But I have a feeling I would just carry heavier loads and be back in the same boat.
I understand I can load tires, put spacers and widen the rear end, etc.
But my question, without all the details that make it not an easy question is - if all things are equal, is there anything inherently in the design of a bigger machine that would make it more stable? Or would a maxed out smaller tractor with a load at the same height, same weights/ballast, etc. be more stable than a bigger (taller) tractor.
Maybe my real reason for asking is if I can tell the wife I will be safer in a little bigger tractor because of the design, she would like that - and I may have her blessing. I know I can be just as stupid in a big tractor, but is there any safety advantage in moving up - other than not having to "push the envelope" as often.