We use evenflo and so far so good. Its easy to install and our daughter likes it. I have never used the other one. We went with something affordable and something practical that can be used for a boy or girl so our next child can use it as well. We also made sure it would grow with her so we wouldn't have to keep buying new ones.
the truefit is a much better seat. it rear faces to 35 lbs (the current max for any seat in the US) and forward faces to 65 lbs. so you probably won't need another seat, maybe a booster. the truefit also has a lifespan of 7 years, and the other seat expires after 6 years.