which one is better? sony wx200 or sony H300 or sony H200

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This depends on your needs, budget, and where you want to go with photography.

The WX200 is a pocket ;Point & Shoot' type of camera and will be ok for the casual user who is not interested in getting into photography.

The H300 and H200 are the DSLR types and will give you more flexibility. Pick the H300.

I am a Nikon user and take a look at the Nikon Coolpix series before you buy. You can see them here: http://www.bhphotovideo.com/c/search?atclk=Brand_Nikon&ci=8612&N=4288586279+4291315846