I'm not tall enough to judge Wayne, but the Synergie Mistral is a little more powerful. That would be useful on those IoW hills, the southern "alps" in particular.
Neither are at the powerful end where hill climbing is concerned, but the most suitable bikes for climbing are at the top end of the price range, so not an option.
Much depends on where you are riding in the island of course, the north eastern quarter being fairly easy, but some of those hills in the south and near Yarmouth could be hard work.
.