How many of you use p2p like: odc,dc++,ares,or torents like:demonoid...and why?

First of all DC++, ODC are illegal, torrents are not. Everybody can create a torrent, but downloading torrent's isn't ilegal always.
torrents are the best way to go, you can always be certain that the file is the real deal because of the one who hosted it, they have more things. I just use ODC to download music because on the torrents they usually have music by concerts and album.
But I don't usually need to use torrents because I buy stuff original, if I give credit to a game, then why would I buy it from the torrents?

Well,while public torrents can be slower,the best thing in them is that,you can get a variety of things in there,and if you are looking for something off the beaten track or less in popularity,there is most chances that it would be found in torrents;And P2P only showcases things that are almost most often as fast as torrent does,only that you have to search for them;So,the best thing would be to balance between the two,depending upon what you are downloading;

I can only comment on the one I use, torrent. Not all download there are slow. It depend on the system and available bandwidth of the source. There are times when even with less numbers of seeds/peers(sometimes even without peers) the download is fast because either they're on unlimited bandwidth or they are on a fast system.

I use Torrent only. And only private trackers with ratio. On public trackers I have download speed on 3-4 kB/s, on private full speed (64 kB/s). You have to look for invites on forums. I recommend Torrents! But... Not for illegal.