Many moons ago I did an FI(H) with one and taught at another. All things being equal it comes down to the people who are going to train you. First impressions count for a lot, so go and visit each training school and talk to the instructors who would actually be teaching you. If possible find someone who has recent experience of the FI(H) course and ask them for their opinion.
You are looking to spend a lot of money, and whoever you train with needs to offer you a well structured course, I preferred 9-5:30 five days a week as it suited me at the time. That way you can rattle through it fairly quickly. However you must see what they are each offering. Remember you are the customer and expect to be treated as such.
Well thats my two pennyworth, Good Luck!