They are similar and Tririga probably is a little advanced but other tools such as Manhattan is probably better. I've demo'd that product and it has some valuable attributes. I'd work with either given their capabilities but believe that Tririga could use some updating. I like the idea of selecting an entire area of seats which you can grab and drop into a list instead of selecting one by one using Tririga.
I haven't used any similar products but the legacy software that was in use was very limited in auditing capabilities and was not very user friendly or easy to learn. TRIRIGA was mostly selected because it allowed the client a large amount of possible growth. They could implement their current processes and then start using different parts of the system along with finding bottlenecks in their current process.