When comparing Clockwork Tomato vs Strive Uptime, the Slant community recommends Clockwork Tomato for most people. In the question“What is the best Android Pomodoro app?” Clockwork Tomato is ranked 3rd while Strive Uptime is ranked 9th. The most important reason people chose Clockwork Tomato is:
All timers are high customizable especially with regard to durations and sounds.
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Pros

Pro Highly customizable work and break timers
All timers are high customizable especially with regard to durations and sounds.
Pro Tasker integration
Pro Customizable interface
You can change the colors and customize elements of the clock.
Pro Widget
The widget's look is also customizable.
Pro Activity log
Logs your pomodoros and displays them on a timeline.
Pro todo.txt integration (with plugin) so you can pomodoro against a todo.txt task

Pro Can be configured to continuous timers
You can set it to start one timer after another automatically, until you manually stop it.

Pro Pre-end alert
Can be configured to deliver a different sound e.g. 1 minute before a timer finishes.

Pro Do Not Disturb mode
Can automatically enable DND mode during timer.

Pro Pause button
Timer can be paused and resumed without stopping it completely.

Pro Configurable timer
Pro Easy to use
Cons

Con No pause button
Work or break timers cannot be paused, only stopped completely, forcing you to start another work session all over again, and even resetting the Pomodoro count until the next long break.
Con todo.txt plugin file picker and multi counter preferences manager can confuse

Con Not a Pomodoro app
There are no break or long break timers
