Before you set off on one of the 3 peaks, can you navigate or do you have someone going with you who can? The question of which one is the easiest is not quite the right question. With the possible exception of Whernside, the 3 peaks route does not follow the easiest route up and down each peak as it is a point to point route.
If you have any balance issues, I would be hesitant about you tackling the route without an escort. There are some very steep ups and more importantly downs.