The answer depends on a few things.
1) What are your career goals?
-If you want to work in a hospital your resume will be stronger if you have a BSN or MSN. Where I currently work ONLY BSN prepared new grads are being hired. Some places are less strict, some accept ADNs and others will accept ADNs if they have a degree in a different field.
-Areas such as school nurse and community health also usually require a BSN.
-If teaching is your goal you will be best fit with an MSN, so your quickest route would be a direct entry MSN program. Same goes for NP (although most people suggest/require bedside experience).
-If you want to work in a nursing home or a clinic I would suggest finding the quickest, cheapest, accredited online degree. At the end of the day what matters most is if you are licensed, not where you went to school.
-It has been my experience that ADN programs are MUCH more difficult than BSN programs, yes it's true! I went through an ADN prog. and an on-line RN-BSN prog. (taking the same classes as the conventional BSN students) and I found the BSN prog to be much more LEARNING based compared to the TEST PREPARATION based ADN program.
2) What is your money situation?
-ADN programs are almost always MUCH less expensive than BSN programs (~$10,000 vs ~$30,000). But since you already have a degree you could probably find a prog. that is fairly inexpensive. If you have any inclination of some day getting your MSN, you would save a lot of money by just doing it up front.
3) Time consideration.
-You say you want to get into the profession quickly. I've seen accelerated BSN programs advertised that claim they only take 1-1.5 years to complete. Are they the best education?...maybe not, but if you are a self motivated learner you will be able to make up the difference as far a theory is concerned.
-Where the rubber meets the road is the clinical experience. Your readiness for practice and your job prospects are highly influenced by the amount of clinical hours in the program. For example, one of the schools around here has their students spend 4-6 months straight in their final term on one unit in the hospital. ALL of these students get jobs if they want them (unless they just make a bad impression).
Really there are a lot of things to run through a matrix to figure out what works best for you. I would strongly consider not doing the ADN program in general. But all areas/situations are unique so I would look for local input.