When comparing HootSuite vs Talon, the Slant community recommends Talon for most people. In the question“What are the best Twitter clients for Android?” Talon is ranked 3rd while HootSuite is ranked 4th. The most important reason people chose Talon is:
Pictures are overlayed on top the screen and can be pinch-zoomed.
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Pros

Pro Customizable feed aggregation
HootSuite gathers activity from numerous social networks into a dashboard display. Activity can be filtered into separate streams, and those streams can be arranged across multiple tabs.

Pro Large list of supported networks
In addition to Twitter, Facebook and LinkedIn, HootSuite supports many networks not covered by similar services; examples include YouTube, Tumblr, Foursquare and MySpace.

Pro Automated post scheduling recommendations
When scheduling a post, HootSuite recommends a time to post for maximum viewership. This can be overridden.
Pro In-app image viewing
Pictures are overlayed on top the screen and can be pinch-zoomed.
Pro Talon Pull
A feature called Talon Pull creates a quick-access (from you notification area) pop-out window that shows your timeline. Does not require opening an app and does not show an icon in the status bar.
Pro Real-time notifications
At the expense of more battery consumption you can have notifications pop-up as the events take place.

Pro TweetMarker Support
Pro Embedded Youtube video support
Youtube videos play back within the app.
Pro In-app browser
You can follow links and articles without having to leave the application.
Pro Theme support
Light, Dark and Pitch Black themes are available out of the box and you can also download/create other themes.
Pro Native Dashclock Widget support
Dashclock Widget brings advanced features and notifications to your lock screen, including Talon notifications.
Pro Supports 2 users
Allows for easy switching between 2 Twitter accounts.
Pro Powerful filters
Allows for filtering out only videos, pictures or links.
Cons

Con Steep learning curve
HootSuite is notoriously complex, and their HootSuite University learning resource is a paid premium feature.
Con Lack of functionality
Unable to insert image to scheduled tweet. Invisible some menu in dark theme.
Con Drains battery
Depletes battery life.
