First electric toothbrush...Oral b io 3 or Oral b pro 1000?

Looking to get my first electric toothbrush and have been researching for the last week but can't make my mind up. Looks like the pro 1000 is $40 and the io 3 is $60...can anyone steer me in a direction?

I read that the io is better but the head replacement is expensive. But then I read the battery replacement is simple on the io where the pro is not.

Help please!