Accept / Decline Session --- WIP

Can't make up my mind with one of these.

This UI element will be in a tableview, surrounded by segments in a schedule view. There's a vast difference in dev effort between these options, so I want to make sure that I'm not just picking the one that 'looks cool'.

Lowest dev effort would most likely be the bottom row, and the 2 middle ones in the left and center columns.

However, I like the slider as a user action because it will require more user intent to trigger the interaction... but it will take longer to develop unless there's a library out there for that exact interaction.

Anyways, any ideas?

Full size shot and another one for how they will appear in context are attached.