High-back booster seat or no back booster seat?

Which of the two is better? My oldest is 35 pounds and I know here in the next 6 months to a year she will have to get a booster seat. Her carseat is only good until she hits 40 pounds. I have the shoulder belts in my minivan so I figured the high-back seats would be best but I have no clue. What do you recomend?
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