I find that there are so many that you have to just use one for a while and see if you like it (kind of meta, that).
The biggest differentiators are the UI, configurability (of times, alarms, etc.), and for me, oddly, the ability to have/not have a "ticking" sound while it's going. I like it to keep me motivated, others hate it and prefer music. Sometimes I use both.
The biggest differentiators are the UI, configurability (of times, alarms, etc.), and for me, oddly, the ability to have/not have a "ticking" sound while it's going. I like it to keep me motivated, others hate it and prefer music. Sometimes I use both.