FL makes more sense to those who are more used to computers than audio technology. Reason is vice versa. They're both very solid.
FL is more of a complete DAW, but it cannot compete with professional products. Reason works better when it's used with another professional DAW as essentally a giant VST plugin. It's also got better live performance capabilities, if that's what you're wanting.
Problem for beginners is that Reason can sound very plasticy and underproduced, while FL can sound very samey to every other track made with FL, due to use of the same built in instruments. Reason comes with a much more complete set of synths, samplers, etc which are very flexible, while to make a good quality track with FL, you need to look into getting hold of VSTs and DX plugins, which may better be used with a more professional DAW.
Up to you really, try both and see what fits. Use both and be worshiped by the AP regulars.