DVC members want to try to travel in the first 8 months of a UY since it allows points to still be banked if you have to cancel a trip more than 30 days in advance (if you cancel with less than that, the points go into a "holding" account which has it's own rules and restrictions).
With a Feb UY, you would have to until the end of September to bank points, with April UY, you would have until the end of November.