Franchises are good for the training and support. Check with other franchise owners about their experiences with the franchisor.
Food ones don’t always make enough money, especially for the first generation owner, since they often require a whole lot of money between franchise fees, building out the facility and working capital. In many cases, it’s more cost effective to buy one that is already in business. The kosher market is generally not worth it.
Depending on your interests and aptitude, a service franchise may be a better option, since they are lower in operation and startup costs.