"Best" symbiotic pistol shrimp?

[CoreyK]

I'm thinking I'm going to do a pistol shrimp/watchman goby pair in my 20g.
Is there a "best" pistol shrimp that is preferable to obtain? Ie., most attractive, most active, most likely to pair up etc...

Any input is appreciated,
Thanks!

 

[Sugar Magnolia]

I've had a randall's pistol and a tiger pistol. My tiger pistol is much more active and out and about, moving sand around than my randalls ever was.

 

[ROB2005]

Yellow watchman/Tiger Pistol: One of the best pairs out there, the pistol is constantly active day and night, ceaselessly moving sand about.

 

[geffhardy2]

I would say a watchmen and a tiger pistal shrimp or a high-fin goby and tiger pistal shrimp. The black ray or white ray high-fin goby are a little bit more active then the watchmen.