The really honest answer is none of them. Producing a WYSIWYG web creator that truly works has never been achieved. Just look at the money Apple spent to put out a total dog's dinner named iWeb.
Appreciate you are not looking for a commercial site and wouldn't want to spend time taking on board higher level skills just to help someone out. Really not worth spending money on upgrading Net Objects, or buying Serif, both fairly chronic.
Stick with what you have, or just download one of the many free site creators. click here is an example, far from perfect but will still produce a better site than Net Objects and they have a good support community.