Which layout would work best?
I would recommend the following:
1. make sure you have a minimum of 36" in front of the washer/dryer and hallway width
2. I would probably move the toilet to the wall between the Laundry and Bath, if you have a minimum of 36" between the tub and wall. I would install blocking in the wall for future grab bars. since you'll have the walls opens installing blocking now for future grab bars saves you money in the long run. same for tub.
3. install at least 32" wide doors (36" width if possible) in the event someone were to need a wheel chair/walker in the future it would be cheaper to install wider doors now than in the future.
"You get what you pay for, and sometimes free costs more!"