When it comes to revive enabled game modes such as trials, salvage, skirmish, etc. you want a sniper that can kill a player even if they have a res shield. Out of all the legendary/exotic snipers in ttk, only 4 can do that. Eirene rr4 is a sniper that can only be attained from the gunsmith as a package drop or an armsday weapon. It has unfamiliar omolon scopes & a lower than average aim assistance stat so it generally is not used often. Stillpeircer is a hunter exclusive sniper with decent perks but an awkward scope which can't be changed as it instead has barrel upgrades. It is only attainable from a gunsmith quest which requires you to get 100 sniper kills with a special or sniper telemetry active & then dismantle rare or legendary snipers. Black spindle is the highest impact sniper in ttk. It has a smaller magazine than the other 3 & it's perks are very pve based. It can only be aquired by completing a challenge mode version of the "lost to light" mission when it is the daily heroic. It has a single scope with varying barrel upgrades meant for different styles of play. While it can be used to great success in pvp by more skilled players it normally isn't used at all as it takes an exotic slot. 1000 yard stare is a vanguard sniper with fairly average stats. It doesn't have requirements to be obtained as it can drop from rare/legendary engrams, vanguard packages, & nightfall strike rewards. It is most commonly obtained from the taken war quest as a reward for one of the beginning sections. It can drop with very good scopes, pvp or pve perks, & has a slightly above average aim assistance stat at 56. You can get 1000 yard from a ridiculous number of sources compared to the alternatives. It's kind of sad how little variety we've been given when it comes to good snipers.