Best tool to automate Appian application currently

There are lot of discussion present around which one is best tool to automate Appian application in forum, but those are old discussion.
There are lot of changes happened into Appian as well as old automation tools. Also few more tools came into market.
In our organization we are currently looking for tool to automate our Appian application which helps to make it consistent in all aspect.
If anyone using any tool then please share their experience also . Also please suggest which one is best tool we can use now.