Youtube web services on different Android devices

To get a list of YouTube videos, I use this web service:

https://gdata.youtube.com/feeds/api/videos?q=flowers

      

        
        
        
      

    

I am getting a different list of videos. My problem is getting three different video urls for each video. Which one should you use for which devices?

How to support multiple resolutions and multiple player formats like Flash Player and regular 3gp / mp4 / rtsp playback player.

I got some information from Google Youtube API

Video URL codes define the formats below

1 - Mobile video (H.263)
5 - Embeddable player
6 - Mobile video (MPEG-4 SP)

But how can you check which device is suitable for a given type of video?