When we joined there was no choice over use year and have to say it really has not made much difference to us. If you were always going to go the same time of year you may want a use year just before your planned visit, especially if you were not planning a visit every year. In reality the whole deal is so flexible the use year may be an uneccesary worry.
We actually have two use years ( bought an additional resale) and while that can be be a little thought provoking at times it doesn;t affect when we actually go.