The tripehound would have been far more famous and successful had it not been for navy/RFC BS (Only around 150 sopwith triplanes were build because of this..) The RFC were stuck with sub standard equipment while the Germans actually avoided fighting the RNAS Tripehounds up in the north.
The Sopwith entered service in June 1916, with the DRI entering service over a year later in August 1917, so it is quite unfair comparing them.
Also, comparing the DRI vs the SE5A is like comparing an A6M to a 190. The SE5A was by
far the better combat aircraft.