Some people use Kadee, some use Tension Lock, & then there are the special types such as Dinghams, Sprat & Winkle, etc.
If it is just your railway, it doesn't matter what you choose, but if you intend joining a group, find out what they are using, for compatibility.
Edit: As Cromptonnut suggests, there is a layout using Tension lock - http://www.rmweb.co.uk/community/index.php?/topic/50114-progress-at-ramchester/page-5