I say go the EMT route.... much better experience, you will learn much more clinically/academically, and actually be responsible for good patient care (rather than just bathing/changing diapers/etc with no clinical responsibility/knowledge). Let me just share some of the CNA's I have met by riding on the ambulance over the past week...
1) CNA called an ambulance 6 and a half hours after an 82-yo man fell, because he had a head laceration with "uncontrollable bleeding." Upon my arrival, it was barely oozing. I successfully controlled the bleeding with a 4x4 piece of gauze and tape. CNA still insisted on transport to the furthest hospital. Upon arrival at the hospital, the patient was discharged about 3 min 29 seconds after we got him in the hospital bed. The only reason it took so long was that the MD had to remove all the immobilization gear we had to put on the patient... even though he managed to survive 6.5 hours without any neuro deficits.
2) CNA at an assisted living facility called 911 because she noticed bruises on a patient that had just moved in that day. Patient was found in bed and denies falling. By the coloration of the bruises, they were at least 1-2 weeks old. Again, CNA demanded transport to ED. Again, the patient was summarily discharged without x-rays or treatment, as soon as the MD could remove the backboard.
3) CNA at a nursing home notices that one of her residents hasn't been seen since lunch the day before. Goes to check on the patient, and concludes that she must be tired because she is still sleeping. When the patient doesn't show up for the next day's meal, she finally decides to call 911. This CNA was unable to recognize the signs and symptoms of stroke, and let the patient stroke out for 48 hrs. This basically means she killed the patient, since the therapy of choice (TPA) has a 3-hour window from start of symptoms.
The scary part is, I could go on and on with hundreds of more examples... Do yourself a favor, the EMT class/EMS work will gain you loads more clinical experience, will better prepare you for med school, will be more fun, and you might actually get a clue