When comparing SourceForge vs Gitbucket, the Slant community recommends Gitbucket for most people. In the question“What are the best alternatives to GitHub for Open Source projects?” Gitbucket is ranked 10th while SourceForge is ranked 13th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Useful business software comparison system
Business software comparison tool is very useful for finding the right business software.
Pro SourceForge offers a lot of helpful features for open source projects
Every project hosted on SourceForge can have discussion boards, and issue tracker, a tab for screenshots and something most code hosts don't have: a Shell access. Developers can also websites for their projects for free on SourceForge, as well as a Wiki for documentation.
The downside to this is that there is a lot of clutter in the beginning, and it may take a long time for beginners to check what they need and what they don't and where everything is.
Pro Easy for downloading projects
SourceForge makes it easy for users to download software hosted on it. It detects the user's platform and provides them with an appropriate version. They also have an extensive mirror network all over the world, which helps speed up downloads.
For developers, they offer download stats which are grouped by platform and by region.
Pro Safe downloading
Malware Scanner ensures safe downloading.
Pro Good support
Support is quick & ticket creation and follow up system is good.
Pro Easy to install
Pro Wiki and issues available
GitBucket has support for wiki, issues, pull requests and mail notification.
Pro Supports public and private repositories
GitBucket supports both public and private repos, as well as user management (only allowed to administrators).
Pro Online file editing
Support for file editing right from the browser UI is supported.
Pro LDAP support
The Lightweight Directory Access Protocol is an application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network.
Pro Monthly release
New version of GitBucket released every month.
Cons

Con Cluttered UI
Compared to other hosts, Sourceforge's UI feels messy and cluttered. Ads take up large portions of screen real estate, and feature creep has resulted in buttons and links everywhere that can sometimes make it difficult to find what you're looking for.
Con Can not rename or delete user
GitBucket just disables user login and deletes user's repository.
Con Still has some features that have not yet been implemented
Some features are still missing, but are in the process of being implemented. Such as:
- Network graph
- Statistics
- Watch / Star
