Re: Kokikai vs Aikikai
There is a lot of difference in the technical syllabus and approach of Kokikai vs mainstream Aikido. The difference is enough that you should pick one or the other and stick with it for awhile; switching before you've trained for a couple of years is likely to be an exercise in unlearning.
And having said that, Kokikai is a smaller organization. If you want access to their top-level people, you might have to travel farther for seminars and such.