Right Approach for developing FPM applications

Dear All,

I am confuse, over the right approach for developing FPM applications.

I searched on google, and in most of example it is shown as you need to first develope webdynpro component. And then you can put in FPM under freestyle component. But I developed one component directly into FPM using FORM & LIST UIBB's.

what are merits and demerits of directly developed FPM component over WD component into FPM ?

so can anyone help me on this.

Thanks In Advance.

P$G