I used both EK Bio/1001 Q's and Kaplan's section tests. They each serve different purposes and are good at what they do. EK Bio/1001 are way better for targeted weakness improvement, ie specific studying on the concepts you know you need to learn. Kaplan sectionals, on the other hand, are good when you want to practice bio in a general sense without any particular emphasis on topic. In addition, the Kaplan sectionals have a tendency to be very challenging, and this can only help you on test day (better be used to a hard bio section and be pleasantly surprised at the easiness of the test than the other way around).
So overall, if you know specifically what you need to learn, use 1001/EK to nail your problem areas, but if your just wanting practice at a section or want to hone test taking/critical thinking skills, take a kaplan section.