Are 9 month leases a good idea?

Found an apartment in Seattle, a city I’m relocating to, with a rent just around my budget and it’s just near perfect. However, the rate is for a 9 month lease and it costs $300 more for a 12-month term. When the 9 months are up, how significant would a rent increase be? Is there a less chance of a significant rent increase if I sign up for 12 months instead?