Hello
If you havent already, you can find more information about dojo selection on
http://www.aikidofaq.com/misc/index.html
Other considerations if you're torn between two dojos are: fees, whether you would enjoy training with the people there, whether the way they train and what they train meets what you want to get out of aikido, closeness to where you live and ease of getting to the dojo.
Hope this helps and all the best for your training