Same. But senuke profile creation is automated so it is less time consuming. However, angela and paul are cheaper when it comes to rates but needs to be done manually.

No difference other than volume.

Paul / Angela style backlinks are supposed to be "high PR," but the PR is coming from the domain, not the page itself. (Which is important.)

So, IMO, you may as well go for volume if you're going the profile link route.

Angela and paul backlinks are probably more likely to stick because they make the profile and post, then leave it a week before dropping links

what kind of back links should I get

Everytime I tried profile links since Panda I have not seen any noticeable increase in rankings, I really don't see the point of putting the time in these nowadays even if they are easy to do.

EDIT: They are ok for trying to get stuff indexed though I guess... But I would rather use indexing services personally.

The actual pagerank of the profiles are N/A from both senukex and Angela. so why not go after senukex. If you have scrapebox you can scrape your own niche related forums and add it to senukex , create profiles there.

Since the Panda update, link building has become almost worthless. Google now ranks mostly based on unique content so work on developing your website properly. I'm working on my money site properly and than I'm going to make a bunch of smaller sites with less focus... there are other ways to rank though