differece between few recent post widgets and usage?

hi i use recent global posts to show posts from some blogs and livestream widget to show all post from network, can you tell me whats difference between this widgets and

it seems that they work same thing? i also use site categories plugin to sort sites by language, can you tell me what of this 3 linked plugins + live stream widget is good to customise to show posts from only one category. i mean if user select on registration category for germany, to make widget that show posts only from all germay category sites.