Marathon Training plan choices?

I know there is a long way to go before April, but I figured I would start looking at choices for Training plans....and I'm glad I looked now. There are so many choices!  In fact, it's quite bewildering how many variations there are.  Some focus on time-based runs, some on mileage, while others different again. So far for other training , I have been using the plan feature of the Asics website...